Seismicity and seismotectonics of West Saxony, Germany — new insights from recent seismicity observed with the Saxonian seismic network
Seismicity and seismotectonics of West Saxony, Germany — new insights from recent seismicity observed with the Saxonian seismic network
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德国西萨克森州的地震活动和地震构造——萨克森地震台网观测到的近期地震活动的新见解
DOI：
10.1007/s11200-008-0033-z
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发表时间：
2008
影响因子：
0.9
通讯作者：
S. Wendt
中科院分区：
文献类型：
--
作者：
M. Korn;S. Funke;S. Wendt
西萨克森州的一个新的永久记录地震台网大大提高了该地震活跃地区的探测阈值、定位精度和深度确定。 2001 年至 2007 年间，已定位了 900 多起事件。地震活动主要发生在莱比锡和沃格特兰/波西米亚西北地区之间的一条南北延伸带上，局地震级在-0.8到2.8之间。地震活动清楚地描绘出南北走向的莱比锡-雷根斯堡 (L-R) 断层带，以及大致走向 NNW-SSE 的格拉-雅希莫夫 (G-J) 断层带。震源深度可分为两个深度范围，一个深度在10公里以下，第二个深度在10公里以下，仅从Vogtland向S-N延伸，直到L-R和G-J断裂带的交叉处。 2006 年 8 月在韦尔道/茨维考附近发生的一次小地震序列，其震中几乎与 1997/98 年早期序列的震中相同，似乎证实了这一发现：利用双差技术对 15 个事件进行的相对定位，清楚地揭示了深度约为 6 公里和 12-14 公里的两个不同的子群。随着台站覆盖范围的改善，可以根据 P 极性和 P/S 比确定群震区以北 L-R 断层带沿线事件的 33 个新断层面解。它们与 Vogtland/NW-Bohemia 地区的解决方案没有显着差异，并且大多与南北向断层面兼容。具有或不具有倾滑成分的走滑机制占主导地位。
A new network of permanently recording seismic stations in West Saxony has considerably improved detection threshold, location accuracy and depth determination in this seismically active region. Between 2001 and 2007 more than 900 events have been located. Seismicity mainly occurred along a band stretching north-south between Leipzig and Vogtland/NW Bohemia area with local magnitudes ranging between −0.8 and 2.8. Seismicity clearly delineates the Leipzig-Regensburg (L-R) fault zone striking N-S, and the Gera-Jachymov (G-J) fault zone striking roughly NNW-SSE. The hypocentral depths can be divided into two depth ranges, one at depths below 10 km, and a second at less than 10 km depth that only extends S-N from the Vogtland until the crossing between L-R and G-J fault zones. A small earthquake sequence that occurred near Werdau/Zwickau in August 2006 at almost the same epicenters as an earlier sequence 1997/98 seems to confirm this finding: a relative localization of 15 events with the double-difference technique clearly reveals two distinct subclusters at about 6 and 12–14 km depth. With the improved station coverage 33 new fault plane solutions from events along the L-R fault zone north of the swarmquake area could be determined from P-polarities and P/S ratios. They do not differ significantly from solutions in the Vogtland/NW-Bohemia area and are mostly compatible with a N-S oriented fault plane. Strike slip mechanisms with or without a dip slip component dominate.