Imaging of small-scale structures and time-dependent changes in the rupture area of the 2010 Maule earthquake

2010 年马乌莱地震的小型结构成像和破裂区域随时间的变化

• 批准号: 197012074
• 负责人: Professor Dr. Frederik Tilmann
• 金额: --
• 依托单位: Sektion 2.2: Geophysikalische Abbildung des Untergrunds
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/197012074?language=en
• 关键词: Imaging; small; scale; structures; time

The overarching aims of the entire Bündelantrag have been described in the summary document. In this project we will apply targeted seismological techniques to image the plate interface, i.e., the subduction channel and its immediate surroundings. Using local seismic network recordings of the aftershock sequence of the Mw=8.8 Maule earthquake of 2010, we will map seismic discontinuities using migration and waveform modelling of reflected or converted waves in order to find evidence of small scale variations in the geometry and properties of the plate interface and oceanic and continental crust. We will also apply an event cluster based method that allows determining Vp/Vs/, which is particularly diagnostic to the presence of fluids, practically in situ and, provided the expected abundance of clustered seismicity, also with high temporal resolution. In particular we would like to know in how far transient, possibly fluid driven processes control the immediate and longer-term postseismic evolution and if variations in the topography of the plate interface or the elastic properties of the subduction channel can be correlated with variations in pre-seismic locking and co-seismic and post-seismic slip pattern.

摘要文件中介绍了整个联邦议院的总体目标。在这个项目中，我们将应用有针对性的地震技术来成像板块界面，即，俯冲通道及其周围环境。使用当地地震台网记录的余震序列的Mw=8.8马乌莱地震的2010年，我们将映射地震不连续性使用迁移和波形建模的反射波或转换波，以找到证据的小规模变化的几何形状和属性的板块界面和海洋和大陆地壳。我们还将应用基于事件聚类的方法，该方法允许确定Vp/Vs/，其特别诊断流体的存在，实际上在原位，并且提供聚类地震活动的预期丰度，还具有高时间分辨率。特别是，我们想知道在多远的瞬态，可能是流体驱动的过程控制的即时和长期的震后演变，如果在板块界面的地形或俯冲通道的弹性属性的变化可以与地震前锁定和同震和震后滑动模式的变化。

项目成果

Applicability and Bias of VP/VS Estimates by P and S Differential Arrival Times of Spatially Clustered Earthquakes

空间聚集性地震 P 和 S 差异到达时间的 VP/VS 估计的适用性和偏差

• DOI: 10.1785/0120150300
• 发表时间: 2016
• 期刊: Bulletin of the Seismological Society of America
• 影响因子: 3
• 作者: F. Tilmann;B. Schurr
• 通讯作者: B. Schurr

The 2015 Illapel earthquake, central Chile: A type case for a characteristic earthquake?

• DOI: 10.1002/2015gl066963
• 发表时间: 2016-01-28
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Tilmann, F.;Zhang, Y.;Dahm, T.
• 通讯作者: Dahm, T.