论文部分内容阅读
对腾冲火山地区的地震活动时空分布及震情参数的研究结果表明，与火山活动区有关的地震活动具有以下特征：周围构造地震活动频繁而火山群地区则处于地震活动相对平静的背景，震级较低（最高为５．０～６．０级）；地震活动以小的震群活动为主，微震主要发生在腾冲县城南部的热海热田地区。长期的地震频率ｂ值高，达１．２左右；震源深度在０～２０ｋｍ范围，受周围构造大地震的影响，导致火山区地壳内部岩浆活动引起的岩浆冲击型地震发生；火山体地下低速层的存在与地下热物质有关。从腾冲火山活动区地震的时空分布特征和震情参数特征表现出与世界上其它火山地震的相似关系，表明腾冲火山不是死火山，火山体地壳内部存在的岩浆囊或岩浆移动通道内岩浆仍在活动。
The results show that the seismic activity related to the volcanic activity area has the following features: the surrounding tectonic activity is frequent and the volcanic group area is in the background of relatively calm seismicity, the magnitude is relatively Low (up to 5.0-6.0). Seismicity was dominated by a small earthquake swarm. The microseismic occurred mainly in the Atami-hetian area in the southern part of Tengchong County. The long-term seismic b value is high, reaching about 1.2. The focal depth is in the range of 0 ~ 20km. Due to the influence of the surrounding tectonic earthquakes, magmatic impact type earthquakes caused by magmatic activities in the crust of the volcanic area occur. The existence of underground thermal substances. The temporal-spatial distribution and the characteristics of the earthquake parameters from the Tengchong volcanic activity area showed similarities with other volcanic earthquakes in the world, indicating that the Tengchong volcano is not an extinct volcano, and the magma within the volcanic crust or magma moving channel existing inside the volcanic crust is still in activity.