THE ROER VALLEY GRABEN EARTHQUAKE OF 13 APRIL 1992 AND ITS SEISMOTECTONIC SETTING

被引：33

作者：

CAMELBEECK, T

VANECK, T

机构：

[1] Royal Observatory Belgium, Brussels, B-1180

[2] Institute of Earth Sciences, University of Utrecht, Utrecht, 3508 TA

来源：

TERRA NOVA | 1994年 / 6卷 / 03期

关键词：

D O I：

10.1111/j.1365-3121.1994.tb00499.x

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A moderately sized pure, normal dip-slip earthquake occurred in the Roer Valley Graben (RVG) near Roermond, The Netherlands on 13 April 1992 at 1h 20m UTC. This contribution presents an overview of the locations, fault-plane solutions and magnitudes obtained for the mainshock and the aftershocks by the different scientific groups involved in their analysis. The observed maximum intensity of VII is compared with that of other earthquakes in the region to illustrate the relatively low level of damage caused by the mainshock. Using SH and Lg waves recorded at seven local and regional broad-band stations, we determine a seismic moment of 1.4 x 10(17) Nm, a static stress drop of 9.7 MPa and an average displacement of 33 cm over a rupture surface of approximately 11 km2. The seismotectonics of the region extending from the RVG to the city of Liege including the western part of the Rhenish Massif (WRM) and the eastern part of the Brabant Massif (EBM) is analysed based on the Roermond earthquake studies and data collected since 1985 by the Belgian seismic network. The geographical distribution of focal mechanism reveals four different seismotectonic regimes in this area. From stress tensor inversion we find that sigma3 coincides with the minimum horizontal stress component in the RVG, the WRM and possibly in the EBM, while in the Liege region sigma3 is approximately vertical. The minimum horizontal stress component shows a 30-degrees rotation to the north in the WRM and the Liege region and possibly 50-degrees in the EBM when compared with the minimum horizontal stress component in the RVG.

引用

页码：291 / 300

页数：10

共 48 条

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