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

• 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

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.

北安纳托利亚断层区（NAFZ）在历史时期造成了许多毁灭性地震。在此处提出的研究中，我们旨在对NW土耳其NAFZ的生物材料界面和低速损伤区的存在和特性进行成像。我们的调查将集中于在地震周期中代表三个不同阶段的NAFZ的四个部分：（1）1912 MW = 7.4 Ganos地震的破裂； （2）伊斯坦布尔海上的马尔马拉段； （3）1999 MW的破裂= 7.4 izmit地震； （4）1944 MW = 7.3地震的破裂。该分析将主要使用断层区的头部波和断层区捕获波进行，这为存在尖锐的双质界面的存在提供了最大的诊断信号，以及用于成像其地震特性的最高分辨率工具。获得的高分辨率图像将有助于NAFZ上地震和断层动态的基本方面，包括地震破裂的模式和传播方向，触发和有效的本构定律。最后，根据预期即将到来的主震，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有关。

项目成果

Imaging the Mudurnu Segment of the North Anatolian Fault Zone From Waveforms of Small Earthquakes

根据小地震波形对北安纳托利亚断裂带穆杜尔努段进行成像

• DOI: 10.1002/2017jb015198
• 发表时间: 2018
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Najdahmadi;Hrubcová;Vavryčuk;Bohnhoff
• 通讯作者: Bohnhoff

Bimaterial interfaces at the Karadere segment of the North Anatolian Fault, northwestern Turkey

土耳其西北部北安纳托利亚断层卡拉德雷段的双材料界面

• DOI: 10.1002/2015jb012601
• 发表时间: 2016
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Najdahmadi;M. Bohnhoff;Y. Ben-Zion
• 通讯作者: Y. Ben-Zion