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High-resolution imaging of material interfaces at the North Anatolian Fault Zone (NW Turkey) from near-fault seismic recordings

根据近断层地震记录对北安纳托利亚断层带（土耳其西北部）物质界面进行高分辨率成像

基本信息

批准号：
208987811
负责人：
Professor Dr. Marco Bohnhoff
金额：
--
依托单位：
Sektion 4.2: Geomechanik und Wissenschaftliches Bohren
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/208987811?language=en
关键词：
resolution imaging material interfaces North

项目摘要

The North Anatolian Fault Zone (NAFZ) has produced numerous large devastating earthquakes in historic times. In the here proposed study we aim at imaging the presence and properties of biomaterial interfaces and low-velocity damage zones at the NAFZ in NW Turkey. Our investigation will focus on four segments of the NAFZ representing three different stages during the seismic cycle: (1) the rupture of the 1912 Mw=7.4 Ganos earthquake; (2) the Marmara segment offshore Istanbul; (3) the rupture of the 1999 Mw=7.4 Izmit earthquake; and (4) the rupture of the 1944 Mw=7.3 earthquake. The analysis will be done primarily with Fault Zone Head Waves and Fault Zone Trapped Waves, which provide the most diagnostic signal for the existence of sharp bimaterial interfaces, and the highest-resolution tool for imaging their seismic properties. The obtained high-resolution images will contribute to fundamental aspects of earthquake and fault dynamics on the NAFZ, including the mode and propagation direction of earthquake ruptures, triggering and effective constitutive laws. Finally, this project is relevant for improved models of expected seismic shaking in the Istanbul-Marmara region in the light of the expected forthcoming mainshock.

北安纳托利亚断裂带（NAFZ）在历史上曾发生过多次特大破坏性地震。在此处提出的研究中，我们的目标是对土耳其西北部的 NAFZ 生物材料界面和低速损伤区域的存在和特性进行成像。我们的调查将集中于 NAFZ 的四个部分，代表地震周期中的三个不同阶段：（1）1912 年 Mw=7.4 加诺斯地震的破裂； (2) 伊斯坦布尔近海马尔马拉航段； (3) 1999年Mw=7.4伊兹米特地震的破裂； (4)1944年Mw=7.3级地震的破裂。分析将主要使用断层带头波和断层带陷波来完成，它们为尖锐双材料界面的存在提供最具诊断性的信号，以及用于对其地震特性进行成像的最高分辨率工具。获得的高分辨率图像将有助于了解 NAFZ 地震和断层动力学的基本方面，包括地震破裂的模式和传播方向、触发和有效本构定律。最后，鉴于预计即将发生的主震，该项目与伊斯坦布尔-马尔马拉地区预期地震震动的改进模型相关。