剪切产热不稳定性及其在研究深源地震发生机理上的应用

本文运用稳定性分析的方法,研究在粘弹性介质（Maxwell体）中剪切产热不稳定性的发生条件,并讨论其对于深源地震发生机理的应用.结果表明,在板块向下俯冲的过程中,由粘滞损耗产热将会发生剪切不稳定性,这为解释深源地震发生提供了一个基础.

SHEAR HEATING INSTABILITY AND ITS APPLICATION TO THE STUDY OF MECHANISM OF DEEP FOCUS EARTHQUAKES

Shear instability originated from viscous heating due to shear strain in a Maxwell body is investigated- Using the approach of stability analysis we have deduced the condition under which shear heating instability occures and discussed the implication for the origin of deep focus earthquakes. The result shows that there exists such an occurrence circumstance of shear instability in subducted plates below 300 km depth, provided the viscosity of plate rocks, as shown by many of theoretical and experimental studies, to be strongly temperature dependent. It may provide a useful basis for the explanation of the mechanism of deep focus earthquakes which mainly occur in subducted zones.