Multiscale seismic imaging of the San-Andreas-Fault system

圣安德烈亚斯断层系统的多尺度地震成像

• 批准号: 65636216
• 负责人: Professor Dr. Stefan Buske
• 金额: --
• 依托单位: Institut für Geophysik und Geoinformatik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/65636216?language=en
• 关键词: Multiscale; seismic; imaging; San; Andreas

The main objective of project SAFOD (San-Andreas-Fault-Observatory-at-Depth) is to answer fundamental questions about the physical and chemical processes controlling faulting and earthquake generation within a major plate-bounding fault. In that respect significant progress has been achieved recently by acquiring and analyzing various geoscientific data sets. We propose to contribute to this understanding by constructing detailed crustal transects across this plate boundary zone from seismic imaging on different scales. On one hand we want to reprocess existing industry seismic reflection data and USGS seismic refraction data ("SJ6" transect) using innovative seismic imaging techniques (Fresnel-Volume-Migration) in order to map and to analyze its large-scale structural inventory and tectonic environment. We expect that such a reprocessing will resolve in particular the large-scale depth structure and the deep roots of the San-Andreas-Fault system, which has not yet been achieved using recent seismic data sets. On the other hand we want to process microseismic data recorded within the SAFOD borehole, which have illuminated nearby branches of the fault system, using reflection seismic techniques in order to reveal the fine-scale fault structure in the close vicinity of the borehole. These imaging results can be directly used as a calibration tool for seismological investigations as well as borehole studies during the ongoing drilling phase at SAFOD. This multiscale approach will deliver comprehensive seismic images which can be used as a basis for a profound characterization of the subsurface environment and can decisively contribute to the understanding of the seismogenic processes at this major plate bounding fault system.

Safod项目的主要目标（San-Andreas-Fautt-observatory-tepth）是回答有关控制断层和地震产生的主要板块结构断层中的物理和化学过程的基本问题。在这方面，最近通过获取和分析各种地球科学数据集实现了重大进展。 我们建议通过从不同尺度上的地震成像构建跨该板边界区域的详细地壳样带来为这种理解做出贡献。一方面，我们希望使用创新的地震成像技术（FRESNEL-VOLUME-VOLUME-EGRATION）重新处理现有的行业地震反射数据和USGS地震折射数据（“ SJ6”样带），以分析其大规模结构清单和构造环境。我们预计，这种重新处理将尤其解决大规模深度结构和San-Andreas-tault系统的深层根源，而使用最近的地震数据集尚未实现。另一方面，我们希望使用反射地震技术来处理Safod钻孔中记录的MicroseSisic数据，这些数据已在井眼附近照亮了断层系统的附近分支，以揭示井眼附近的细尺度断层结构。这些成像结果可以直接用作地震学研究的校准工具以及在SAFOD正在进行的钻孔阶段的井眼研究。这种多尺度方法将提供全面的地震图像，可以用作地下环境的深刻表征的基础，并可以决定性地理解该主要板界断层系统的地震生成过程。