地震研究

2009年汤加M_S7.7地震的震相特征分析^*

陈翔,沈道康,夏丽红,邓存华,李雷

(云南省地震局,昆明 650224)

关键词：汤加地震; 数字记录; 分析对比

Features of the Seismic Phases of M_S7.7 Tonga Earthquake in 2009

CHEN Xiang,SHEN Dao-kang,XIA Li-hong,DENG Cun-hua,LI Lei

(Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)

Keywords：Tonga Earthquake; digital waveform; analysis of phase

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参考文献

对昆明地震台数字地震仪记录到的2009年3月19日汤加M_S7.7地震的震相进行分析,并将其与兰州、成都、恩施、太原、贵阳五个地震台的记录进行对比,提出了汤加地震的记录特征、分析难点和注意点,同时介绍了对此类SKS波先于S波达到的地震,如何避免将SKS震相误判为S震相的分析方法。

We analyze the waveform of the M_S7.7 Tonga Earthquake occurred on March 19,2009,which is recorded by the digital seismometers at Kunming Seismic Station,and contrast it with those recorded by other seismic stations such as Lanzhou,Chengdu,Enshi,Taiyuan and Guiyang in China.Thus,we find the features of the waveform of the earthquakes occurred in Tonga,for example,the SKS-phase precedes the S-phase.Then we put forward some methods to help the seismographer correctly determine the SKS-phase and the S-phase.

引言
1 资料说明
2 昆明台震相分析
3 其他台站震相分析
4 结语

表1 台站基本信息<br/>Tab.1 Basic information of the station

表1 台站基本信息
Tab.1 Basic information of the station

图1 在仿真KIRNOS记录上初步判读震相<br/>Fig.1 Preliminary identification of the seismic phases of the records got by simulating KIRNOS seismometer

图1 在仿真KIRNOS记录上初步判读震相
Fig.1 Preliminary identification of the seismic phases of the records got by simulating KIRNOS seismometer

图2 昆明台在仿真WWSSN-SP记录上判读S震相与SKS震相<br/>Fig.2 Identifying the S-phase and SKS-phase of the records got by simulating WWSSN-SP seismometer

图2 昆明台在仿真WWSSN-SP记录上判读S震相与SKS震相
Fig.2 Identifying the S-phase and SKS-phase of the records got by simulating WWSSN-SP seismometer

图3 在仿真WWSSN-SP记录上判读S震相与SKS震相后,再在仿真KIRNOS记录上用理论震相加以验证<br/>Fig.3 Checking the S-phase and SKS-phase on the simulated KIRNOS seismogram after identifying them on the simulated WWSSN-SP seismogram

图3 在仿真WWSSN-SP记录上判读S震相与SKS震相后,再在仿真KIRNOS记录上用理论震相加以验证
Fig.3 Checking the S-phase and SKS-phase on the simulated KIRNOS seismogram after identifying them on the simulated WWSSN-SP seismogram

图4 昆明台在仿真KIRNOS记录上的分析结果<br/>Fig.4 Results of the seismic-phase identification on the simulated KIRNOS seismogram at Kunming seismic station

图4 昆明台在仿真KIRNOS记录上的分析结果
Fig.4 Results of the seismic-phase identification on the simulated KIRNOS seismogram at Kunming seismic station

图5 汤加MS 7.7地震兰州台的波形记录(a)仿真基式波形记录;(b)仿真短周期波形记录<br/>Fig.5 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Lanzhou seismic station(a)Simulated KIRNOS seismogram;(b)Simulated short-period seismogram

图5 汤加MS 7.7地震兰州台的波形记录(a)仿真基式波形记录;(b)仿真短周期波形记录
Fig.5 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Lanzhou seismic station(a)Simulated KIRNOS seismogram;(b)Simulated short-period seismogram

图6 汤加MS 7.7地震成都台的波形记录(a)原始速度波形记录;(b)仿真短周期波形记录<br/>Fig.6 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Chengdu seismic station (a)Preliminary waveform;(b)Simulated short-period seismogram

图6 汤加MS 7.7地震成都台的波形记录(a)原始速度波形记录;(b)仿真短周期波形记录
Fig.6 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Chengdu seismic station (a)Preliminary waveform;(b)Simulated short-period seismogram

图7 汤加MS 7.7地震恩施台的波形记录(a)仿真长周期波形记录;(b)仿真短周期波形记录<br/>Fig.7 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Enshi seismic station (a)Simalated long-period seismogram;(b)Simulated short-period seismogram

图7 汤加MS 7.7地震恩施台的波形记录(a)仿真长周期波形记录;(b)仿真短周期波形记录
Fig.7 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Enshi seismic station (a)Simalated long-period seismogram;(b)Simulated short-period seismogram

图8 汤加MS 7.7地震太原台的波形记录(a)仿真基式波形记录;(b)仿真短周期波形记录<br/>Fig.8 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Taiyuan seismic station(a)Simulate KIRNOS seismogram;(b)Simulated short-period seismogram

图8 汤加MS 7.7地震太原台的波形记录(a)仿真基式波形记录;(b)仿真短周期波形记录
Fig.8 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Taiyuan seismic station(a)Simulate KIRNOS seismogram;(b)Simulated short-period seismogram

图9 汤加MS 7.7地震贵阳台的波形记录(a)仿真基式波形记录;(b)仿真短周期波形记录<br/>Fig.9 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Guiyang seismic station(a)Simulate KIRNOS seismogram;(b)Simulated short-period seismogram

图9 汤加MS 7.7地震贵阳台的波形记录(a)仿真基式波形记录;(b)仿真短周期波形记录
Fig.9 Waveforms of the MS 7.7 Tonga Earthquake on Mar.19,2009 recorded by Guiyang seismic station(a)Simulate KIRNOS seismogram;(b)Simulated short-period seismogram