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GEOALGAR Project: First Results on Seismicity and Fault-plane Solutions

机译：GEOALGAR项目：地震和断层平面解决方案的第一个结果

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摘要

The project GEOALGAR, initiated in May 2000, is devoted to the geodynamic monitoring and seismic characterization of the Algarve region. A brief description of the project goals, as well as the first results concerning the analysis of the recent seismic digital data, from 1999 and 2000, are presented. After simultaneous inversion of the seismic data and the velocity model parameters, the relocation of the hypocenters was performed for two selected areas. Twenty-five earthquakes were used for Area 1 and 125 earthquakes for Area 2, selected from the period 1999–2000 and with magnitude M_L ≥ 2.0. The results show that there are two main regions where there are more events: the Monchique region (inland) and another one in the area of Guadalquivir Bank (ranging from 36.4°N, 08°W to 36.8°N, 7.2°W); for Area 1, the hypocentral corrections are relatively small, with the focus slightly deeper than that in the old solution; for the more regional events, the hypocenters corrections are bigger, with the focus becoming more shallow. Fault-plane solutions for the recent events were also estimated, showing that best solutions are dominated by strike-slip movement consistent with a stress controlled by a horizontal compression in the NW-SE to NNW-SSE direction, with two exceptions showing reverse mechanisms, with maximum horizontal stress orientation slightly rotated to a N-S direction. These results are also in agreement with those presented in previous studies performed by different authors. The new epicentral locations show a more organized spatial distribution that could indicate a possible correlation with some known tectonic features. However the fault-plane solutions are considerably more difficult to correlate with the neotectonic features.
机译：GEOALGAR项目于2000年5月启动，专门用于阿尔加威地区的地球动力学监测和地震特征描述。介绍了项目目标的简要说明，以及有关分析最近的1999年和2000年地震数字数据的初步结果。在同时反演地震数据和速度模型参数后，对两个选定区域进行了震源重定位。从1999-2000年选择M_L≥2.0的1区25个地震和2区125个地震。结果表明，有两个主要区域发生了更多的事件：Monchique地区（内陆）和瓜达尔基维尔河地区的另一个区域（范围从北纬36.4°，北纬8°到北纬36.8°，南纬7.2°）;对于区域1，震中校正值相对较小，其焦点比旧解决方案中的焦点稍深;对于更多的区域性事件，震源的校正量更大，焦点越来越浅。还估算了近期事件的断层平面解，显示出最佳的解决方案是以走滑运动为主，该走滑运动与在NW-SE到NNW-SSE方向上的水平压缩控制的应力一致，但有两个例外，它们显示的是反向机制，最大水平应力方向稍微向NS方向旋转。这些结果也与不同作者先前的研究结果一致。新的震中位置显示出更有条理的空间分布，这可能表明与某些已知的构造特征可能存在关联。然而，断层平面的解决方案与新构造特征的关联要困难得多。

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