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Seismic and Seismological Features of the Vogtland-Bohemia Earthquake Swarms - in preparation for a high resolution seismic survey and scientific drilling

沃格特兰-波希米亚地震群的地震和地震学特征 - 为高分辨率地震勘测和科学钻探做准备

基本信息

批准号：
167739190
负责人：
Professor Dr. Serge A. Shapiro
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：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2013-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/167739190?language=en
关键词：
Seismic Seismological Features Vogtland Bohemia

项目摘要

Repeated earthquake swarms and exhalation of mantle-derived CO2-enriched fluids are important expressions of presently ongoing magmatic processes in the intra-continental lithospheric mantle of the Western Eger rift region. The geodynamic nature and the implications of these processes are far from being understood. Neither the origin of magmatic activity (upper mantle or lower crust?) nor the geodynamic role of fluids are well constrained. We would like to address these issues by modern reprocessing of two deep reflection seismic profiles from neighbouring areas (German DEKORP MVE-90 and Czech 9HR profiles). We will establish correlations between deep microseismic and reflecting structures. The seismic imaging approaches will be universal for both profiles. The microseismic data and reflection structures will be obtained using common velocity models. This will improve possible correlations and enable a comparison of the Eger Rift features to reflection and microseismic features of the neighbouring KTB site, where a similar methodology has been already applied. The expected results (and a small magnetotelluric feasibility study included in this proposal) will help to design a new high resolution seismic reflection profile crossing a persistent swarm area of the Cheb Basin. Such a profile, in turn, will be a pre-site study for scientific drilling.

反复震群和来自地幔的富CO2流体的喷发是西伊格尔裂谷地区大陆内岩石圈地幔目前正在进行的岩浆作用的重要表现。地球动力学的本质和这些过程的含义还远未被理解。岩浆活动的起源(上地幔或下地壳？)流体的地球动力学作用也没有受到很好的限制。我们希望通过对邻近地区的两条深反射地震剖面(德国DEKORP MVE-90和捷克9HR剖面)进行现代再处理来解决这些问题。我们将建立深部微地震和反射结构之间的关联。地震成像方法将对这两个剖面通用。微震数据和反射结构将使用普通速度模型获得。这将改善可能的相关性，并能够将Eger Rift特征与邻近KTB场地的反射和微震特征进行比较，在那里已经采用了类似的方法。预期结果(以及本提案中包括的一项小型大地电磁可行性研究)将有助于设计一条新的高分辨率地震反射剖面，横跨CHAB盆地持久的群集区。这样的侧写反过来将是科学钻探的前期研究。