著者

入山 淳

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.21, no.1, pp.14-20, 1968

---

The internal structures of Venus, Marss, and the asteroid are examined in the light of the thermal state. The angular velocity of rotation, surface magnetic field strength, and <i>C</i>/<i>Ma</i>² are used as constrained conditions.<br>Results of calculations show that the model terrestrial planets with chondritic composition are consistent with the above constrained conditions, provided that the smaller the size of planets is, the lower the initial temperature is.<br>The internal structure of Venus is similar to that of the earth. From the thermal structure and the slow rotation, the initial temperature within Venus is about 300-400deg. higher than that of the earth.<br>The initial temperature of Mars should be below 600&deg;K, provided that Mars is free of the metallic core.<br>The asteroid must have an iron core, a mantle, and a crust, provided that the initial temperature throughout within the asteroid was above 1, 300&deg;K.