地震地磁观测与研究
地震地磁觀測與研究
지진지자관측여연구
SEISMOLOGICAL AND GEOMAGNETIC OBSERVATION AND RESEARCH
2014年
3期
89-95
,共7页
震源深度%深度震相%sPn震相%波形互相关%滑动时窗相关法%彝良地震
震源深度%深度震相%sPn震相%波形互相關%滑動時窗相關法%彝良地震
진원심도%심도진상%sPn진상%파형호상관%활동시창상관법%이량지진
focal depth%depth phase%sPn phase%waveform cross-correlation%sliding window cross-correlation%Yiliang earthquake
通过理论地震图模拟，研究 sPn 震相特征，分析其影响因素。研究表明：sPn 与 Pn 震相的初动极性关系在不同台站方位角呈现不同特点，基于 sPn 震相的深度定位方法更适合于中强地震。以2012年9月7日12时16分彝良 MS 5．6地震为例，利用南北地震带南段密集流动地震台阵的观测数据，采用波形互相关方法拾取 Pn 波走时，应用滑动时窗相关法识别 sPn 震相，通过 sPn 与Pn 震相走时差，测定震源深度为9．6 km。
通過理論地震圖模擬，研究 sPn 震相特徵，分析其影響因素。研究錶明：sPn 與 Pn 震相的初動極性關繫在不同檯站方位角呈現不同特點，基于 sPn 震相的深度定位方法更適閤于中彊地震。以2012年9月7日12時16分彝良 MS 5．6地震為例，利用南北地震帶南段密集流動地震檯陣的觀測數據，採用波形互相關方法拾取 Pn 波走時，應用滑動時窗相關法識彆 sPn 震相，通過 sPn 與Pn 震相走時差，測定震源深度為9．6 km。
통과이론지진도모의，연구 sPn 진상특정，분석기영향인소。연구표명：sPn 여 Pn 진상적초동겁성관계재불동태참방위각정현불동특점，기우 sPn 진상적심도정위방법경괄합우중강지진。이2012년9월7일12시16분이량 MS 5．6지진위례，이용남북지진대남단밀집류동지진태진적관측수거，채용파형호상관방법습취 Pn 파주시，응용활동시창상관법식별 sPn 진상，통과 sPn 여Pn 진상주시차，측정진원심도위9．6 km。
With modeling theoretical seismograms,we studied the characteristics of sPn phase and analyzed the factors that may affect the phase.The result showed that the polarity of sPn with different azimuth angle may be different,and the depth location method based on the sPn phase is more suitable for M 4.0-6.0 earthquakes.Taking the Yiliang MS 5.6 ecent on September 7,2012 as an example,we obtained its focal depth is 9.6 km using the seismic waveforms recorded by the seismic array deployed in the southern section of the North-South seismic belt.The focal depth is determined from the arrival-time differences between sPn and Pn phase.The Pn waves are picked by the waveform cross-correlation method,and the sPn phases are identified by using the sliding-window correlation method.
