中源地震脱水脆变机制的岩石学研究进展

夏阳, 张立飞^*

The Advance of Petrologic Mechanism of Dehydration Embrittlement in Intermediate-depth Earthquakes

Xia Yang, Zhang Lifei

图4 俯冲带地震分布与相关系图（a）日本东北俯冲带热结构, 太平洋板块由西向东俯冲到亚欧板块之下；（b）结合相图计算与（a）图热结构, 得到俯冲板块不同区域含水量, 从而与实际观测的俯冲带地震震源位置（黑点所示）相比较。地震主要发生在含水相区域, 罕见于不含水区域。（据文献 [ 8 ] 改绘）
Fig. 4 Correlation between seismicity and phase relations in subduction zones a Thermal structure of the Tohoku subduction zone in northern Honshu, Japan. The Pacific plate is subducting beneath the Euro-Asia plate； b The empirical link between seismicity and phase transformations shows that the earthquakes occur chiefly in rocks predicted to contain abundant hydrous phases and is absent or less abundant in rocks predicted to contain anhydrous phases or only trace hydrous phases after reference [ 8 ]