青藏—西蒙古高原周缘与华北地区大震构造机制初探及设想建议

A Preliminary Study of Tectonic Mechanism of Strong Earthquakes around Qinghai-Tibet Plateau and Western Mongolia Plateau

一、网络构造体制及其成生机制和地震活动性中国及外围地区莫霍面深度分布图(1/1500万)呈现出以准经向与准纬向为主、深层隆坳相间与浅层基底盆山构造耦合共轭、构成不同走向与不同形态规模的网络构造体制相互拼接的空间构造态势。图1为青藏高原—西蒙古高原及邻区莫霍面深度和构造体制(系)分布。可见:Ⅰ、东亚滨太平洋经向为主的新华夏网络构造体制;Ⅱ、亚洲大陆中部纵贯南北的青藏高原—西蒙古高原网络构造体制;亚洲大陆南部与印度洋之间。

Enlightened by the Map of moho-depth distribution of China and its adjacent areas recently compiled, we attempt to study the genetic mechanism of large earthquakes with M=7～8 concentrated in the area studied here. Present crust network structural system and crust-mantle boundary coupled differences were mainly generated during the period of Himalayan movement. The driving force mainly comes from Earth' s rotation effect in solar system movement. Based on the facts that present seism-tectonic active zones are coincident with the differential tectonic zones in the crust network structural system, we propose a new technical ideal for digital modeling of earthquake prediction studies.