著者

長岡 信治 新井 房夫 檀原 徹

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.119, no.1, pp.121-152, 2010-02-15 (Released:2010-05-21)

参考文献数

75

被引用文献数

5 7

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The study investigates the past 1 Ma tephrostratigrapy of the Miyazaki plain in southern Japan. There are over 50 tephra layers, 80% of which originate from Kirishima volcano 25 km west of the plain. Several widely spread marker tephra layers in the layers and fission-track dating are used to establish tephrochronology. The explosive eruptive history of the volcano was reconstructed on the basis of tephrostratigraphy and tephrochronology. The history has two volcano groups: Pre-Kirishima 900-600 ka and Kirishima 600-0 ka. Pre-Kirishima volcanoes are unknown in detail. Kirishima volcano is divided into the Older Kirishima volcano, 600-330 ka, and the Younger Kirishima volcano, 330-0 ka. The Older Kirishima is characterized by calder-forming eruptions and large-scale pyroclastic flows, > 100 km3 in volume. Older Kirishima consists of four stages: O1 (600-530 ka), O2 (530-520 ka), O3 (520-340 ka), and O4 (340-330 ka). The tephra of O1 includes over five crystal-enriched ash fall layers, which indicate that vulcanian and phreatomagmatic eruptions occurred intermittently at that stage. O2 is the first calder-forming stage, in which the Kobayashi-Kasamori pumice fall and pyroclastic flows and Kobayashi caldera were formed. The pumice falls and a co-ignimbrite ash fall of the pyroclastic flow were dispersed over 1000 km east of the source, and covered the western half of the main island of Japan. O3 tephra layers are composed of over ten tephra layers formed by intermittent plinian and phreatomagmatic eruptions. The latter indicates that lakes emerged in the caldera. O4 stage is a large-scale eruption with the Kakuto pyroclasatic flow and Kakuto caldera forming. The Kakuto pyroclastic flow was accompanied by a pumice fall and a scoria fall. They were small-scale scatterings near the source from small-scale eruptions, while the co-ignimbrite ash fall reached Kanto, which is 1000 km east of the source. The Younger Kirishima began with intermittent pumice and scoria falls soon after the O4 stage. The Younger Kirishima forms the main landform in the Kirishima volcano. Most of the Younger Kirishima tephra layers of more than twenty scoria and pumice falls were caused by plinian and sub-plinian eruptions accompanied by lava flows. The activity of the Younger Kirishima volcano is subdivided into four stages: Y1 (330-130 ka), Y2 (130-50 ka), Y3 (50-30 ka), and Y4 (30-0 ka) on the basis of thick soil and erosive horizon, which suggest quiet volcanic activity with no eruptions or only lava flow eruptions. Y1 includes over five tephra layers from sub-plinian eruptions in the western part of Kirishima volcano. There is a long quiet period between 240 ka and 130 ka. Y2 has six scoria falls, which show sub-plinian eruptions in the western part of the volcano. Y3 tephra is composed of Uchiyama pumice fall, Iwaokoshi pumice fall, and Awaokoshi scoria fall. Iwaokoshi from Onaminoike 40 ka old and Awaokoshi from Hinamori-dake 30 ka old, were much larger eruptions than other tephra of the Younger Kirishima volcano. Forming stratovolcano at the source, they reach the Pacific Ocean and Miyazaki plain 50 km east of the source, while most of the Younger Kirishima tephra are distributed near Kirishima volcano. Y4 has more than ten pumice, scoria, and ash falls, which include historically recorded tephra layers. Of them, the Kirishima-Kobayashi pumice fall from Karakuni-dake 16.7 ka spread over the widest area, covering half of the Miyazaki plain and reaching the Pacific Ocean.

著者

澤田 結基 武田 一夫 川辺 百樹 藤山 広武

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.120, no.5, pp.853-863, 2011-10-25 (Released:2012-01-17)

参考文献数

12

被引用文献数

4 8

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We conducted an experimental geotour, which was monitored by professional nature guides, to improve our geotour plan and guiding techniques. We asked the nature guides to fill out a questionnaire and give advices to improve the geotours. The experimental geotours were conducted at the Shikaribestu volcano group and Shikaribetu Lake in central Hokkaido, Japan. We explained the geological history of the volcano group and the mechanism of cold talus slopes filled with ice, in as simple terms as possible. However, the nature guides judged our geotours to be “rather difficult”, indicating that our plan and interpretation need to be improved. Based on the results of questionnaires and comments from the nature guides, we propose some ideas to improve the geotour in general: (1) Eliminate technical terms where possible in the explanations; (2) Use clear figures and pictures in explanations; and, (3) Make a story to connect all the geosites included in a tour. To improve guidebooks: (1) Use bird's-eye view map or other 3D maps instead of contour maps to make it easy to understand the landform; (2) Add glossary of technical terms and scale of geologic time; and, (3) Send the guidebook to participants before the geotour. These ideas may help to deepen the participant's' understanding and to achieve high-level of satisfaction among participants.

著者

岩間 英夫

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.106, no.1, pp.87-101, 1997-02-25 (Released:2009-11-12)

参考文献数

31

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This study attempts to identify internal formation processes of the Muroran steel industrial community by complex steel mills in Hokkaido, the first iron-works of private enterprise in Japan.It then constracts an internal formation process of single manufacturing communities by comparing Muroran with the Kamaishi iron mining-manufacturing region in Iwate Prefecture, the Ube coal mining-manufacturing region in Yamaguchi Prefecture, and the Hitachi copper mining-electrical manufacturing region in Ibaraki Prefecture.The results of the study are summarized as follows.1) Internal formation processes of the Muroran steel industrial community has lead to the following results.1. Muroran started its business as a modern steel industry. Manufacturing community of the Nippon Steel Works consists of a company community and the surrounding affiliated community. A company community of the Nippon Steel Works formed a unipolar concentric zonal structure, in which a productive, a commercial service, and a residential functions were located around the office. The Muroran ironworks formed manufacturing community of a unipolar zonal structure. A unipolar concentric zonal structure corresponds with the cases of Kamaishi, Ube and Hitachi.2. Muroran formed manufacturing city of multipolar zonal structure with two company communities.3. When the system of making steel from are in the same plant was introduced, the Muroran iron works community grew into twice the size while maintaining a unipolar concentric zonal structure. It is termed an expanded unipolar concentric zonal structure. Muroran formed manufacturing city of a multi-expanded polar concentric zonal structure with two company communities.4. A expanded polar concentric zonal structure of the Muroran iron works grew and included a unipolar concentric zonal structure of the Nippon Steel Works. It is formed a core concentric zonal structure. By the enlargement of a productive functions, commercial service and residential districts was spread into the surrounding community. As a result, Muroran formed large manufacturing city of a core concentric zonal structure.5. The steel industry declined. But residential districts was expand into the surrounding community, because both employees and retired peoples established their own houses on the outskirts, resulting in the expansion of urbanized area. The affiliated community on the central lowland grew into the Central Business District. Muroran formed city.6. The above analyses lead to an internal structure model of the Muroran single miningmanufacturing community as proposed in Fig. 5.2) The comparison of Muroran with the Kamaishi, Ube and Hitachi has lead to the following results.1. Whereas Ube and Hitachi have developed from a unipolar to a multipolar and to a core concentric zonal structure, steel industry communities experienced different stages. Kmaishi, restricted by topographical features, stays in a unipolar concentric zonal structure, Whereas Muroran with a enough space developed from a unipolar to a core concentric zonal structure.2. A expanded polar concentric zonal structure was caused by the establishment of the system to produce steel from ore in the same plant. This structure shares an essentially same character with a unipolar concentric zonal structure. Therefore, general internal formation process of single manufacturing communities developed basically from a unipolar concentric zonal structure, to a multipolar and to a core concentric zonal structure.3. The internal formation process model of a single manufacturing community by complex steel mills is proposed in Fig. 6.4. An internal formation process of a single manufacturing community by a steel industry is summarized into Fig. 7-A, while the model of complex steel mills is proposed in Fig. 7-B.

著者

有馬 貴之 青山 朋史 山口 珠美

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.125, no.6, pp.871-891, 2016-12-25 (Released:2017-01-25)

参考文献数

25

被引用文献数

2 3

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Geoparks in Japan conduct several educational programs mostly for elementary and junior high school students, teaching geology and geography. Staff in geoparks teach local geology and geography; however, there are no programs for tourism education. Besides, most are for elementary and junior high students. Hakone geopark has assisted several schools in their educational programs through museums and delivery classes. Two tourism education programs in Teikyo University are presented and their effects on university students collaborating with the geopark are examined to set a benchmark for tourism education programs in geoparks in Japan. Students have participated in the programs with the goals of providing suggestions or operations for geotours at Hakone geopark. Educational effects on students, such as interest in the locality, are observed. Students also learn how to work in groups and about their commitments, how to improve the quality of presentations, how to make suggestions for tour planning, how to adjust and negotiate with local suppliers on creating tours, and how to operate tours on site. In particular, students discover the potential of local icons and resources as tourism resources that reflect the characteristics of the area. These educational effects are supported by human and organizational networks in the geopark. Local suppliers and other stakeholders also understand the concept and support activities besides tourism. These networks and an understanding of the geopark and tourism in the locality are the main factors supporting the programs.

著者

新帶 國太郎

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.30, no.3, pp.178-183, 1918-03-15 (Released:2010-10-13)

著者

佐藤 久

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.90, no.4, pp.Plate1-Plate2, 1981-08-25 (Released:2009-11-12)

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.27, no.4, pp.369-369, 1915-04-15 (Released:2010-12-22)

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.50, no.3, pp.142-142, 1938-03-15 (Released:2010-12-22)

著者

汐見 勝彦 松原 誠 小原 一成

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.117, no.1, pp.45-58, 2008-02-25 (Released:2010-02-10)

参考文献数

35

被引用文献数

2 2

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By the end of the last century, the rough configuration of the Moho discontinuity beneath the Japan Islands had been revealed based on explosion surveys and natural earthquake observations. Recently, however, some researchers have pointed out that local roughness of the Moho geometry or relative location between continental and oceanic Moho might provide important knowledge about the source regions of large earthquakes.  Within the southern portion of the Kinki district, the Philippine Sea plate subducts beneath the continental plate at the Nankai Trough. We detect P-to-S converted wave energy from the Moho velocity discontinuity beneath the Kinki district with receiver function analysis, and compare the results of other recent investigations of the depth of Moho. Both oceanic and continental Moho discontinuities are detected in not only our receiver function analysis but also active-source seismic exploration survey and travel-time tomography analysis. The inferred depths of the subducting oceanic Moho beneath the Kii Peninsula, the southern Kinki district, and the continental Moho beneath the northern Kinki correspond well with each other. However, beneath the central Kinki district, no significant converted phases are observed corresponding to the Moho depth inferred from the travel-time analyses. We interpret that no sharp velocity discontinuity exists around the Moho in the central Kinki district.

著者

苅谷 愛彦 高岡 貞夫 佐藤 剛

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.122, no.4, pp.768-790, 2013-08-25 (Released:2013-09-11)

参考文献数

63

被引用文献数

12 13

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We studied the geomorphological and geological characteristics of four medium- to large-scale landslides that occurred in the alpine and subalpine zones of the northern Japanese Alps and assessed the relationship between landslide features and vegetation diversity in the landslide areas. To achieve this, we conducted field investigation and laboratory work including airphoto interpretation and radiometric dating of soils and fossil logs. Our field investigations indicate that, even in alpine and subalpine zones, landslide blocks (i.e., landslide deposition areas) display specific landforms such as scarplets, shallow depressions, and low mounds with linear or curved forms. Vegetation cover and aquatic areas such as peat bogs and moors also display linear or curved patterns that are superimposed on these small topographic features. We found that the highly diverse landscapes in landslide blocks were substantially different from those in present-day or fossil periglacial slopes near the main ridges, both of which displayed monotonous facies. The specific patterns of vegetation cover seen on landslide blocks probably formed under the influence of different slope environments, with variations of parameters such as inclination, soil properties, thermal-water regimes, and microclimate occurring as a result of landslide activities. Similarly, geomorphic changes such as channel migration and waterfall formation in and around areas of landsliding probably affected biological evolution and differentiation, and resulted in multiple modulations of the gene expression of aquatic organisms. Medium- to large-scale landslides are often reactivated by secondary movement. We suggest that subsequent variations of the landforms in the landslide blocks caused sudden or gradual changes in the surrounding natural environments, which had been forming since the initial mass movement. The biota present in a landslide block is the result of evolution and differentiation during geomorphic changes such as those described here; therefore, it is possible that secondary landsliding resulted in increased biological diversity and complexity.

著者

猪間 收三郎

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.52, no.7, pp.337-341, 1940-07-15 (Released:2010-10-13)

著者

中村 洋一 ハリー グリッケン

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.97, no.4, pp.309-316, 1988-08-25 (Released:2011-02-17)

参考文献数

24

被引用文献数

4 9

著者

伯野 元彦

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.115, no.4, pp.466-469, 2006-08-25 (Released:2009-11-12)

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Recent earthquake damage in Japan has the following features. 1) Damage is not proportional to the recorded acceleration of earthquake. 2) Damage on the soft ground is severer. 3) Most of damage comes from the collapse of old wooden houses. 4) 40% of fires after earthquake are related to electricity.

著者

鈴木 毅彦

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.99, no.2, pp.182-197, 1990-04-25 (Released:2009-11-12)

参考文献数

35

被引用文献数

6 6

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Akagi volcano situated in the North Kanto district of central Japan is a Quaternary volcano. The eruptive history of this volcano during the last 200, 000 years is clarified by the tephrochronological study.The plinian pumice fall deposits derived from Akagi volcano are as follows in ascending order; the Moka Pumice (MoP), Akagi-Mizunuma Pumice-16. …-12, -10…-1 (MzP-16…-12, -10…-1), Namekawa Pumice-2, -1 (Nm-2, -1), Yunokuchi Pumice (UP) and Kanuma Pumice (KP) (Fig. 1). Stratigraphy, distributions and petrographic characteristics of these tephras are described (Figs. 5, 6, 8, 9 and Tables 1, 3).The MoP pumice fall deposit covering the most part of the eastern part of the North Kanto district, erupted in the penultimate glacial stage preceding the Last Interglacial Stage. Moreover, the stratigraphic relations of the MzP-10…-1, Nm-2, -1 and UP with the well dated widespread tephras, which are the K1P-7 (ca. 130 ka), DPm, On-Pm I (ca. 80 ka), K-Tz (ca. 75-80 ka), Aso-4 (ca.. 70 ka) and DKP (ca. 45-48 ka), are clarified (Fig. 7). These data can give the chronological framework for the eruptive history.The MzP series, Nm-2, Nm-1 and UP erupted during the stage called the younger stratovolcano (YS) of the Akagi volcano in previous work (Fig. 10). The total volume of the plinian pumice fall deposits from the MzP-10 to the UP amounts to 28 km3. This corresponds to the discharge rate of the pumice equivalent to 0.33 km3/1, 000 years and the frequency of the plinian eruption 0.15/1, 000 years.Before the formation of the central cone, it occurred the most eruptive episode of Akagi volcano. This is represented by the members : the KP pumice fall deposit (ca. 31-32 ka) and the Mizunuma lithic (chert lapilli) fall deposit (CLP). The volume of the KP deposit which amounts to 25 km3, is the largest volume of the plinian pumice fall deposits derived from Akagi volcano.

著者

小泉 尚嗣

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

pp.2012ap03, (Released:2012-12-05)

参考文献数

62

被引用文献数

7 6

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Research on coseismic and postseismic groundwater pressure changes is important for evaluating long-term groundwater stability in seismically active regions such as Japan. It is also important for preventing and reducing earthquake-induced geological disasters such as landslides. This study reviews literature and clarifies abrupt coseismic changes and subsequent postseismic gradual changes in groundwater pressure. Coseismic changes result from ground shaking and coseismic crustal deformation. Postseismic changes are gradual changes, which can be described by a diffusion equation with new initial values and boundary conditions due to ground shaking and coseismic crustal deformation. The effects of crustal deformation on groundwater pressure appear to be limited in the vicinity of the seismic source region, although that of ground shaking can remain in distant areas. Because a variety of factors and conditions affect earthquake-related groundwater pressure changes, each should be investigated to more accurately clarify the effects on coseismic and postseismic groundwater pressure changes. This research may contribute toward clarifying seismicity mechanisms triggered by distant earthquakes.

著者

小泉 武栄

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.120, no.5, pp.761-774, 2011-10-25 (Released:2012-01-17)

参考文献数

20

被引用文献数

4 6 6

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A geopark involves not only a geological heritage but also geographical and ecological elements. Therefore, subjects related to geotourism are not only landforms and geology, but also ecosystems, including vegetation and animal communities, and human landscapes, such as terraced rice paddies and grasslands created by human activity. Because geotourism covers a broad range of elements, from geo- and ecosystems to human activities, it is expected that the further development of related activities will be supported and approved by an increasing number of people. In this manuscript, I introduce some examples of geo-ecotourism as a special type of geotourism, including: vegetation at the summit area of Mount Hakusan, vegetation in a landslide scar on Mount Bandaisan, and the habitat of Dicentra peregrine on Mount Yatsugatake. These were all very popular with the participants of excursions I conducted. Geotours also promote regional development because they benefit residents economically by employing local workers and travel-related businesses, and encourage consumption of local services and products by visitors. A pressing issue concerning geotourism in Japan is the development of human resources such as tour guides. A geotour needs an excellent guide with a riveting interpretation. There are, however, few of such guides and there is a need to rapidly foster more. As a model for fostering guides, I introduce my “Intensive course on the natural history of mountains,” which interprets the natural history of mountains based on geo-ecology. In the long term, however, it is necessary to introduce natural history education into the school system and improve the quality of nature programs broadcast on TV. Many participants of geotours are middle aged and older, and tend to be energetic and slow to age. This may be because the tour participants are required to do physical activity and to use their common sense. Based on this perspective, a geopark approach must gain in importance within social and lifelong education.

著者

角田 寿喜 後藤 和彦 宮町 宏樹 平野 舟一郎 清水 力 岩切 一宏 中辻 剛 立山 清二

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.106, no.4, pp.476-485, 1997-08-25 (Released:2009-11-12)

参考文献数

26

被引用文献数

1

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A shallow earthquake of MJMA 6.7 on October 18, 1995, at about 50km southeast off Kikai-jima in the Ryukyu Islands caused slope landslides, subsidence of concrete slabs at fishing ports and collapses of walls piled up with coral ragged stones. Several fishing boats moored to wharves were damaged by tsunami; four boats were turned over at ports in Amami-Oshima.From May 19 to 30, 1995, earthquakes of MJMA≤4.1 had occurred in the focal area after a long seismic quiescence since the 1911 Kikai-jima Earthquake of M=8.0. Some of them were felt in JMA intensity 1 or 2 at Kikai-jima. Numerous felt shocks also struck the island immediately after the main shock; 62 and 125 shocks on October 18 and 19, respectively. Numbers of aftershocks decreased rapidly, though they lasted through the end of 1996.The damage distribution of the 1911 event being compared with that of the 1995 event, their focal areas were considered to overlap with each other. It was, however, possibly an interplate earthquake of a thrust fault type in contrast with the 1995 event of a normal fault type in the subducting plate, because the first motions of P wave at Naze and of tsunami wave at Kikai-jima were reversed between the two events.

著者

宇佐美 龍夫

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.94, no.7, pp.656-664, 1986-01-25 (Released:2009-11-12)

参考文献数

6

著者

長谷川 昭 中島 淳一 内田 直希 梁田 高広 岡田 知己 趙 大鵬 松澤 暢 海野 徳仁

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.121, no.1, pp.128-160, 2012-02-25 (Released:2012-03-05)

参考文献数

120

被引用文献数

6 12

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The mechanisms that generate the three main types of earthquake in subduction zones are discussed addressing their relations to geofluids. Studies on the spatial distribution of earthquakes and seismic velocity structure within the subducted slab provide evidence that strongly supports the dehydration embrittlement hypothesis for the generation of intermediate-depth intraslab earthquakes. Detailed imaging of the seismic velocity structure in and around plate boundary zones suggests that interplate coupling is mainly controlled by local fluid over-pressure. Seismic tomography studies show the existence of inclined sheet-like seismic low-velocity zones in the mantle wedge, not only in Tohoku but also in other areas in Japan, which perhaps correspond to the upwelling flow of the subduction-induced convection system. These upwelling flows reach the Moho directly beneath the volcanic areas, suggesting that those volcanic areas are formed by the upwelling flows. Aqueous fluids derived from the slab are probably transported up through the upwelling flows to the arc crust, where they might weaken the surrounding crustal rocks and finally cause shallow inland earthquakes. All of these observations suggest that geofluids expelled from the subducting slab play an important role in the generation of earthquakes in subduction zones.

著者

中谷 友樹 矢野 桂司

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.117, no.2, pp.506-521, 2008-04-25 (Released:2010-06-02)

参考文献数

37

被引用文献数

3 6

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To detect spatio-temporal pattern of crime clusters/hotspots, the possibilities of three-dimensional mapping methodologies for crime event data are explored using two approaches: three dimensional kernel-density mapping using a volume rendering technique and visualisation of cylindrical significant clusters that can be detected by space-time scan statistics. Both approaches are intended to visualise spatio-temporal domains with high densities of crime in a three-dimensional space composed of two geographical dimensions and one time dimension. The proposed three-dimensional mapping methodologies are evaluated through application to a dataset of snatch-and-run offences in Kyoto City during the period 2003-2004. The results are summarized as follows: (a) Three-dimensional crime mapping enables effective visualisation of the geographical extents and duration of crime hotspots simultaneously. This method is particularly useful to identify geographical diffusion and movements of crime clusters/hotspots compared to traditional dynamic analyses of crime mapping using cross-sectional maps with arbitrary time intervals.  (b) In practice, the roles of three-dimensional kernel mapping and space-time scan statistics should be complementary. Space-time scan statistics provide clear-cut domains of crime clusters/hotspots that can be used for secondary analyses, such as evaluation of socio-environmental and temporal characteristics focusing on detected domains. However, we should note that the method assumes cylindrical geometrical-constrains of space-time domains. Three-dimensional kernel density mapping provides fuzzy domains with high densities of crime and a useful basis to assess the validity of the assumption of spatial scan statistics and to investigate detailed space-time sequences of crime clusters/hotspots. (c) Empirical analyses of the snatch-and-run offence dataset in Kyoto City revealed constant clusters/hotspots during the study period in central Kyoto and around Kyoto Station as well as transient clusters/hotspots around several railway stations in the suburbs. Temporal differences of transient clusters show geographical movements of hotspots from the north to the south via the west. We also identified that outbreaks of snatch-and-run offences alternated between a pair of cluster areas. These results suggesting so-called displacement phenomena indicate the need to monitor crime events and effects of crime-preventive actions in a widespread space-time context.