安徽及邻区震源深度分布特征研究
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摘要
本文利用安徽及邻区(29°～35°N,114°～120°E)1976年1月—2009年7月重新定位后的地震目录,统计分析了不同空间范围内的震源深度分布特征,结果表明:安徽及邻区平均震源深度8 km,优势深度分布为5～15 km,其中霍山地区震源深度优势分布为3～8 km。中小地震震源深度在空间分布是不均匀的,安徽中西部地区震源深度比其他区域深,总体上西深东浅,南深北浅,造成这样分布的格局可能与安徽地区复杂的地质构造有关。总体而言,安徽及邻区地震经重新定位后震源深度多在2～15 km地壳的中上部,属浅源地震。
In this article,we carried out statistical analysis on the focal depth distribution of earthquakes after relocation with different spatial scales.The result shows that the average of all earthquakes depth is 8 km.However the predominant depth of Anhui region is from 5 to15 km.The predominant depth of Huoshan region is from 3 to 8 km.The spatial distribution of the focal depth of earthquakes is inhomogeneous in Anhui and neighboring regions.From west to east,south to north,the depth of this region decreases gradually;maybe that is due to the seismic tectonics.Overall,the focal depth of earthquakes in Anhui and neighboring region is shallow,ranging from 2 to15 km in the upper crust.
In this article,we carried out statistical analysis on the focal depth distribution of earthquakes after relocation with different spatial scales.The result shows that the average of all earthquakes depth is 8 km.However the predominant depth of Anhui region is from 5 to15 km.The predominant depth of Huoshan region is from 3 to 8 km.The spatial distribution of the focal depth of earthquakes is inhomogeneous in Anhui and neighboring regions.From west to east,south to north,the depth of this region decreases gradually;maybe that is due to the seismic tectonics.Overall,the focal depth of earthquakes in Anhui and neighboring region is shallow,ranging from 2 to15 km in the upper crust.
引文
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[7]李军辉,刘东旺,洪德全,等.安徽及邻区地震震源深度分布特征研究[J].地震地磁观测与研究,2010(1):1-5.
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[9]黄耘,李清河,张元生,等.江苏及邻区地震重新定位和构造特征分析[J].地球物理学报,2008(1):175-185.
[10]谢卓娟,吕悦军,彭艳菊,等.渤海海域地震震源深度分布特征[J].震害防御技术,2008(3):311-320.
[11]丁志峰,曾融生.京津唐地区震源深度分布初探[J].地震学报,1990,12(3):242-247.
[12]陈宇卫,张军,庆梅,等.“霍山震情窗”小震序列运动学参数时变特征研究[J].地震,2007,27(1):26-31.
[13]杨文采,杨午阳,金振民,等.苏鲁超高压变质带岩石圈的地震组构[J].中国科学D辑,2004,34(4):307-319.
[14]毛慧玲,李永莉.云南地区强震前震源深度的时空展布[J].地震地磁观测与研究,2004,25(3):32-41.
[2]高原,周慧兰,郑斯华,等.测定震源深度的意义的初步讨论[J].中国地震,1997,13(4):321-329.
[3]张国民,汪素云,李丽,等.中国大陆地震震源深度及其构造含义[J].科学通报,2002,47(9):663-668.
[4]郑斯华.青藏高原地震的震源深度及其构造意义[J].中国地震,1995,11(2):99-106.
[5]Ma S T,Atkinson G M.Focal depths for small tomoderate earthquakes(m N≥2.8)in western Quebec[J].Southern Ontario and Northern New York.BullSeismol Soc Amer,2006,96(2):609-623.
[6]Saikia C K,Woods B B,Thio H K.Calibration of theregional crustal waveguide and the retrieval of sourceparameters using waveformmodeling[J].Pure ApplGeophys,2001,158:1301-1338.
[7]李军辉,刘东旺,洪德全,等.安徽及邻区地震震源深度分布特征研究[J].地震地磁观测与研究,2010(1):1-5.
[8]Geiger L.Probability method for the determination ofearthquake epicenters from arrival time only[J].Bull.St.Louis.Univ,1912,8:60-71.
[9]黄耘,李清河,张元生,等.江苏及邻区地震重新定位和构造特征分析[J].地球物理学报,2008(1):175-185.
[10]谢卓娟,吕悦军,彭艳菊,等.渤海海域地震震源深度分布特征[J].震害防御技术,2008(3):311-320.
[11]丁志峰,曾融生.京津唐地区震源深度分布初探[J].地震学报,1990,12(3):242-247.
[12]陈宇卫,张军,庆梅,等.“霍山震情窗”小震序列运动学参数时变特征研究[J].地震,2007,27(1):26-31.
[13]杨文采,杨午阳,金振民,等.苏鲁超高压变质带岩石圈的地震组构[J].中国科学D辑,2004,34(4):307-319.
[14]毛慧玲,李永莉.云南地区强震前震源深度的时空展布[J].地震地磁观测与研究,2004,25(3):32-41.
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