2007年8月15日秘鲁M_W8.0地震的破裂震相记录特征
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摘要
对2007年8月15日秘鲁近海MW8.0地震在全球数字地震仪台网(GSN)83个台的宽频带数字记录进行分析,在短周期(SP)、中长周期(SK)和长周期(LP)记录上均识别出在震源破裂过程中由主要破裂激发出的破裂震相。由破裂震相分析结果可以看出:该地震是一个由4次主要破裂构成的地震事件,第2次破裂、第3次破裂和第4次破裂与第1次破裂之间的时间间隔平均约9.1 s、48.5 s和63.3 s,与震源破裂时间函数的结果一致。4次主要破裂激发的破裂震相在GSN台站可识别的震中距范围为1.4°—153.8°。本文给出的破裂震相记录特征,为分析识别其他地震的破裂震相提供了参考。从地震记录图上直接识别破裂震相有助于快速判断震源破裂过程,有助于快速判断震灾损失。
A strong earthquake of magnitude MW8.0 earthquake occurred near the coast of Peru on15 August,2007.This earthquake excited tsunami. We analyzed 83 station′ s recordings of the Global Seismographic Network(GSN) then identifi ed that rupture phase from recordings of short period instrument(SP)、middle-long period instrument(SK) and long period instrument(LP). The Peru MW8.0 earthquake occurred on 15 August,2007,consisted of 4 sub-events ruptured. The different time between fi rst rupture、second rupture、third rupture and fourth rupture are 9.1 s、48.5 s and 63.3 s respectively. This result is consistent with the source time function. The rupture phase may be observed in the GSN. The rupture phase can be identifi ed at the distances rang from 1.4°to 153.8°. This study is helpful for identifying rupture phase of other earthquakes. It is helpful for recognizing rupture process of earthquake and judging disaster loss through identifying rupture phase from recordings of earthquake directly.
A strong earthquake of magnitude MW8.0 earthquake occurred near the coast of Peru on15 August,2007.This earthquake excited tsunami. We analyzed 83 station′ s recordings of the Global Seismographic Network(GSN) then identifi ed that rupture phase from recordings of short period instrument(SP)、middle-long period instrument(SK) and long period instrument(LP). The Peru MW8.0 earthquake occurred on 15 August,2007,consisted of 4 sub-events ruptured. The different time between fi rst rupture、second rupture、third rupture and fourth rupture are 9.1 s、48.5 s and 63.3 s respectively. This result is consistent with the source time function. The rupture phase may be observed in the GSN. The rupture phase can be identifi ed at the distances rang from 1.4°to 153.8°. This study is helpful for identifying rupture phase of other earthquakes. It is helpful for recognizing rupture process of earthquake and judging disaster loss through identifying rupture phase from recordings of earthquake directly.
引文
国家地震局地球物理所.震相走时便查表[M].北京:地震出版社,1980:108-126.
许力生,陈运泰,震源时间函数与震源破裂过程,[J].地震地磁观测与研究,2002,23(6):1-7.
许健生,隗永刚,周建超.中国数字地震仪台网(CDSN)典型震相图集(1990—2012年)[M].北京:石油工业出版社,2014:416
Ammon C J,Ji C and Thio H K et al.Rupture process of the 2004 Sumatra-Andaman earthquake[J].Since,2005:308.
Kennett B L N.IASPEI 1991地震走时表[S]北京:地震出版社,1993.
许力生,陈运泰,震源时间函数与震源破裂过程,[J].地震地磁观测与研究,2002,23(6):1-7.
许健生,隗永刚,周建超.中国数字地震仪台网(CDSN)典型震相图集(1990—2012年)[M].北京:石油工业出版社,2014:416
Ammon C J,Ji C and Thio H K et al.Rupture process of the 2004 Sumatra-Andaman earthquake[J].Since,2005:308.
Kennett B L N.IASPEI 1991地震走时表[S]北京:地震出版社,1993.
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