利用模板匹配技术识别大岗山水库库区爆破事件

采用匹配定位方法，利用大岗山水库库区及附近（29.2°—29.9°N，101.9°—102.5°E）5次已知爆破事件对2014年3月1日至2015年12月31日内连续波形进行模板检测与定位，经过人工复核后共获取23次疑爆事件，这些事件与模板事件间有较高的相关性，相关系数达0.773 4，匹配后疑爆事件数为模板数的4.6倍，提高了对疑爆事件的识别率，同时剔除了原地震目录中人工误判的8次疑爆事件，有效地提高了地震编目质量。将匹配出来的疑爆事件及距离最近的台站记录到的NS向波形分别在Google Earth上投影，从影像图上可见扫描出的事件附近存在采石场或蓄水前修建大坝的场地，较符合爆破实际情况，重定位偏离量基本在0.5 km之内。研究认为，利用匹配定位的方法，能有效地区分不同类型的地震活动。

Correlation analysis between Tangshan ML 4.9 earthquake in 2019 and the Tangshan M 7.8 earthquake in 1976

At 08:02 on December 5, 2019, an M_L 4.9 earthquake occurred in Fengnan District (39.31°N, 118.04°E), Tangshan, Hebei. The epicenter was located at the intersection of Tangshan fault, Ji Canal fault, and Ninghe-Changli fault. Analysis from the aspects of Tangshan earthquake geological background, seismogenic rule in the source region of the 1976 magnitude 7.8 earthquake and its aftershock epicenter distribution, and the relationship with the magnitude 7.8 earthquake shows that the recurrence time interval of M_L ≥ 4.0 earthquakes varies with the passage of time and the maximum shock interval also gradually increased. The M_L 4.9 earthquake is an aftershock of the magnitude 7.8 earthquake.