汶川地震区断层围陷波探测
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摘要
对汶川地震区开展震后科考和断层围陷波探测,本文主要介绍平通镇断层围陷波探测及初步结果。平通镇处在汶川8.0级地震断层带正上方,地表破坏十分严重。该断层围陷波测线横跨断层,以地震探槽为大致中点,沿NW-SE方向两端延伸,测线长约400 m。这次观测结果表明,在汶川8.0级地震的新破裂带中可以观测到断层围陷波,反映了断层带内外的介质在物理性质上有较大的差异。该测线记录的断层围陷波优势频率大约为3~4 Hz。探槽附近的台站断层围陷波较强,初步推测,该地段地壳内断层的宽度大约有200 m。
After the 2008 Wenchuan 8.0 Earthquake we have done some field investigation at the epicenter region and made a survey using fault zone trapped waves.This paper gives a brief introduction about our survey at Pingtong Town and its preliminary results.Pingtong Town locates just over the fractured zone of the 2008 Wenchuan 8.0 earthquake and the damage at the surface is very serious.The observational line crosses the fractured zone.With its middle point at an earthquake exploration trough,the observational line stretches to the two sides with NW-SE direction.The total length is about 400 m.The results show that the fault zone trapped waves from the fractured zone of the 2008 Wenchuan 8.0 Earthquake are observed.That indicates the great difference.The predominant frequency of the fault zone trapped waves is about 3~4 Hz.It is stronger near the exploration trough.The width of the fault zone in the crust in this region is estimated to be 200 m.
After the 2008 Wenchuan 8.0 Earthquake we have done some field investigation at the epicenter region and made a survey using fault zone trapped waves.This paper gives a brief introduction about our survey at Pingtong Town and its preliminary results.Pingtong Town locates just over the fractured zone of the 2008 Wenchuan 8.0 earthquake and the damage at the surface is very serious.The observational line crosses the fractured zone.With its middle point at an earthquake exploration trough,the observational line stretches to the two sides with NW-SE direction.The total length is about 400 m.The results show that the fault zone trapped waves from the fractured zone of the 2008 Wenchuan 8.0 Earthquake are observed.That indicates the great difference.The predominant frequency of the fault zone trapped waves is about 3~4 Hz.It is stronger near the exploration trough.The width of the fault zone in the crust in this region is estimated to be 200 m.
引文
[1]李松林,张先康,樊计昌.利用断层围陷波研究昆仑山口西8.1级地震破裂面[J].地震学报,2005,27(1):42-50.
[2]楼海,王椿镛,丁志峰,等.昆仑山断层围陷波的分析和研究[J].地球物理学报,2006,49(3):788-796.
[3]王椿镛、丁志峰、杨建思,等.2001年11月14日昆仑山西口Ms8.1地震产生的断层带细结构研究[A].见:中国大陆地震学与地球内部物理学进展—庆贺曾融生院士八十寿辰[C].北京:地震出版社,2004,38-58.
[4]李松林,赖晓玲,何加勇,等.汤西断裂的断层围陷波初步研究[J].地震地质,2007,29(2):354-361.
[5]张培震、徐锡伟、闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1066-1073.
[6]徐锡伟,张培震,闻学泽,等.川西及其邻近地区活动构造基本特征与强震复发模型[J].地震地质,2005,27(3):446-461.
[2]楼海,王椿镛,丁志峰,等.昆仑山断层围陷波的分析和研究[J].地球物理学报,2006,49(3):788-796.
[3]王椿镛、丁志峰、杨建思,等.2001年11月14日昆仑山西口Ms8.1地震产生的断层带细结构研究[A].见:中国大陆地震学与地球内部物理学进展—庆贺曾融生院士八十寿辰[C].北京:地震出版社,2004,38-58.
[4]李松林,赖晓玲,何加勇,等.汤西断裂的断层围陷波初步研究[J].地震地质,2007,29(2):354-361.
[5]张培震、徐锡伟、闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1066-1073.
[6]徐锡伟,张培震,闻学泽,等.川西及其邻近地区活动构造基本特征与强震复发模型[J].地震地质,2005,27(3):446-461.
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