天水地震区深部构造与地震关系初步探讨

A PRELIMINARY STUDY ON THE RELATIONSHIP BETWEEN DEEP TECTONICS AND EARTHQUAKES IN TIANSHUI EARTHQUAKE AREA

摘要:

在对天水地震区人工地震测深解释的基础上,本文提出了对该区深部构造与较大地震形成的关系的初步认识,6级以上大震均与构速有关,7级以上大震与断层交汇有关,M面上隆与M面厚度变异处发生多次强震,本区发生中强震地区的底部有低速层和上地幔低速带。

Abstract:

Based on the interpretation of DSS in Tianshui earthquake area,the preliminary understanding on the relationship between deep tectonics and formation of bigger earthquakes has been got.Bigger earthquakes are related to tectonics for M>6,related to across of tectonics for M > 7.Many stronger earthquakes have happened at the location where the deepth of Moho variates obviously or the Moho upheaves.Beneath the location where stronger earthquakes have happened there are low velocity layer (LVL) in crust and low velocity zone (LVZ) on upper mantle.Above preliminary study may be help us to comprehend the cause of earthquakes in this area.