Colima volcano (19.51 N, 103.62 W, 3860 m.a.s.l.) in western Mexico is well known for its frequent activity. Along with nearby Nevado de Colima, and Cántaro volcanoes are part of a volcanic complex rising in the middle of the Colima graben, a structure on the margin of the Jalisco Block, some one hundred km from the Middle America trench. The activity of Colima volcano is varied and usually accompanied by intense seismicity, mostly of volcano-tectonic events. To investigate several aspects of these earthquakes, we analyzed events recorded by the seismological network of Colima during the outbursts of 1998–1999, 2005, and 2009. Those periods, of varying intensity, lasted from several months to several weeks before and after a significant explosive event. The hypocenters, located with standard methods, appear in a broad region around the volcanic complex. To obtain a more accurate location of these events, we relocated the hypocenters using the method of double differences. A set of 1191 relocated events was obtained, providing improved locations, which show hypocenters clustered under the edifice of Colima volcano and do not seem to be related to any particular geological feature and, therefore, represent the volume stressed by magma’s intrusion. The focal mechanism of the relocated events shows a variety of fault plane orientations with a majority indicating dip-slip faulting.

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墨西哥科利马州科利马火山火山-构造事件的重定位和聚焦机制

位于墨西哥西部的科利马火山 (19.51 N, 103.62 W,​​ 3860 masl) 以其频繁的活动而闻名。与附近的 Nevado de Colima 和 Cántaro 火山一起，是在 Colima 地堑中部上升的火山复合体的一部分，Colima 地堑是哈利斯科地块边缘的一个结构，距离中美洲海沟约 100 公里。科利马火山的活动是多种多样的，通常伴随着强烈的地震活动，主要是火山构造事件。为了调查这些地震的几个方面，我们分析了 1998 年至 1999 年、2005 年和 2009 年爆发期间科利马地震网络记录的事件。爆炸性事件。用标准方法定位的震源，出现在火山群周围的广阔区域。为了获得这些事件的更准确位置，我们使用双差法重新定位了震源。获得了一组 1191 个重新定位的事件，提供了改进的位置，显示震源聚集在科利马火山的大厦下，似乎与任何特定的地质特征无关，因此代表了岩浆侵入压力的体积。重定位事件的震源机制显示了多种断层面方向，其中大多数表明倾滑断层。显示震源聚集在科利马火山的建筑物下，似乎与任何特定的地质特征无关，因此代表了岩浆侵入所造成的压力。重定位事件的震源机制显示了多种断层面方向，其中大多数表明倾滑断层。显示震源聚集在科利马火山的建筑物下，似乎与任何特定的地质特征无关，因此代表了岩浆侵入所造成的压力。重定位事件的震源机制显示了多种断层面方向，其中大多数表明倾滑断层。