地震研究

震相到时的精确捡拾是地震定位的关键所在,是进行地震预警的前提。对云南测震台网的观测数据进行P波自动捡拾试验。用基于幅值和频率的P波识别方法和STA/LTA方法捡拾到的P波到时,与人工捡拾的结果比较接近,取得较好的结果; 用该方法对云南强震台网的部分强震记录的竖向资料进行P波到时自动识别,也获得了较好的结果。

The automatic,accurate detection of the arrival time of the seismic phase is crucial for the earthquake location,and is a prerequisite for earthquake early warning.We use the data acquired by Yunnan Seismic Networks to detect P-wave automatically by the two methods described in the article and get better results which are close to the artificial results.Better results are also gotten when we detect P-wave automatically for some strong,seismic,vertical component recordings by the same method.

引言
1 理论
2 实际应用
3 结论

图1 2007年6月3日10时48分宁洱MS 5.1地震沧源台记录的P波捡拾(a)仿真波形;(b)特征函数<br/>Fig.1 Pick-up of the P-wave of the recordings of the Ning'er MS 5.1 earthquake at 10:48,June 3,2007 recorded by Cangyuan station(a)emulated waveform;(b)eigenvalue function

图1 2007年6月3日10时48分宁洱MS 5.1地震沧源台记录的P波捡拾(a)仿真波形;(b)特征函数
Fig.1 Pick-up of the P-wave of the recordings of the Ning'er MS 5.1 earthquake at 10:48,June 3,2007 recorded by Cangyuan station(a)emulated waveform;(b)eigenvalue function

图2 2007年6月3日10时48分宁洱MS 5.1地震沧源台记录的P波捡拾(用未仿真波形)(a)仿真波形;(b)特征函数<br/>Fig.2 Pick-up of the P-wave of the recordings of the Ning'er MS 5.1 earthquake at 10:48,June 3,2007 recorded by Cangyuan station(no simulation)(a)emulated waveform;(b)eigenvalue function

图2 2007年6月3日10时48分宁洱MS 5.1地震沧源台记录的P波捡拾(用未仿真波形)(a)仿真波形;(b)特征函数
Fig.2 Pick-up of the P-wave of the recordings of the Ning'er MS 5.1 earthquake at 10:48,June 3,2007 recorded by Cangyuan station(no simulation)(a)emulated waveform;(b)eigenvalue function

图3 2007年6月3日05时34分宁洱MS 6.4地震禄劝台记录的P波捡拾(a)仿真波形;(b)特征函数<br/>Fig.3 Pick-up of the P-wave of the recordings of the Ning'er MS 6.4 earthquake at 05:34,June 3,2007 recorded by Luquan station(a)original waveform;(b)eigenvalue function

图3 2007年6月3日05时34分宁洱MS 6.4地震禄劝台记录的P波捡拾(a)仿真波形;(b)特征函数
Fig.3 Pick-up of the P-wave of the recordings of the Ning'er MS 6.4 earthquake at 05:34,June 3,2007 recorded by Luquan station(a)original waveform;(b)eigenvalue function

图4 2007年6月3日10时48分宁洱MS 5.1地震沧源台STA/LTA方法捡拾到的P波(a)原始记录;(b)特征函数;(c)特征波形<br/>Fig.4 Pick-up through STA/LTA method of the P-wave of the recordings of the Ning'er MS5.1 earthquake at 10:48,June 3,2007 recorded by Cangyauan station(a)original waveform;(b)eigenvalue function; (c)eigenvalue waveform

图4 2007年6月3日10时48分宁洱MS 5.1地震沧源台STA/LTA方法捡拾到的P波(a)原始记录;(b)特征函数;(c)特征波形
Fig.4 Pick-up through STA/LTA method of the P-wave of the recordings of the Ning'er MS5.1 earthquake at 10:48,June 3,2007 recorded by Cangyauan station(a)original waveform;(b)eigenvalue function; (c)eigenvalue waveform

图5 精确确定P波触发点<br/>Fig.5 Accurate determination of the P-wave triggerpoint

图5 精确确定P波触发点
Fig.5 Accurate determination of the P-wave triggerpoint

表1 P波到时的人工识别和自动识别结果比较<br/>Tab.1 Automatic and manual identified results of arrival time of P wave

表1 P波到时的人工识别和自动识别结果比较
Tab.1 Automatic and manual identified results of arrival time of P wave

图6 2007年6月3日宁洱MS6.4地震正兴台记录波形自动识别结果(a)原始记录;(b)特征函数<br/>Fig.6 Automatic identification of the recordings of the Ning'er MS6.4 earthquake at June 3,2007 recorded by Zhengxing Station(a)original waveform;(b)eigenvalue function

图6 2007年6月3日宁洱MS6.4地震正兴台记录波形自动识别结果(a)原始记录;(b)特征函数
Fig.6 Automatic identification of the recordings of the Ning'er MS6.4 earthquake at June 3,2007 recorded by Zhengxing Station(a)original waveform;(b)eigenvalue function

图7 2008年8月20日盈江MS5.0地震梁河台记录波形自动识别结果(a)原始记录;(b)特征函数<br/>Fig.7 Automatic identification of the Yingjiang MS5.0 earthquake at August 20,2008 recorded by Lianghe Station(a)original waveform;(b)eigenvalue function

图7 2008年8月20日盈江MS5.0地震梁河台记录波形自动识别结果(a)原始记录;(b)特征函数
Fig.7 Automatic identification of the Yingjiang MS5.0 earthquake at August 20,2008 recorded by Lianghe Station(a)original waveform;(b)eigenvalue function

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备注

引言

1 理论

2 实际应用

3 结论

期刊信息