新疆及周边5次MS7.0以上地震对天山地区小震活动的影响

地震 ›› 2018, Vol. 38 ›› Issue (4): 159-171.

新疆及周边5次M_S7.0以上地震对天山地区小震活动的影响

张琳琳, 唐兰兰

新疆维吾尔自治区地震局, 新疆乌鲁木齐 830011

收稿日期:2016-11-11 发布日期:2019-08-15
作者简介:张琳琳(1986-),女,河南商丘人,工程师,主要从事地震预测、地震活动性研究。
基金资助:
2016年度地震科技星火计划攻关项目(XH16041)及中国地震局震情跟踪定向工作任务(2015010122)联合资助

Influence of Five M_S7.0 earthquakes on Small Earthquake Activities in Xinjiang and its Surrounding Areas

ZHANG Lin-lin, TANG Lan-lan

Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China

Received:2016-11-11 Published:2019-08-15

摘要/Abstract

摘要： 2000年以来新疆及周边发生了5次M_S7.0以上地震, 强震活动结束后, 新疆境内局部应力将重新调整分布, 从而导致一些地区小震活动速率增加, 如2008年3月21日于田7.3级地震后, 乌鲁木齐附近区域M_S1.6以上地震出现增强活动, 同时对这些受强震活动影响的区域进行z值和b值扫描分析, 结果表明: ① 强震前后负z值变化和b值的负变化一致; ② 初步认为, 局部区域小震活动速率增加和小震增强区内对应中强震与强震震级大小、时间间隔以及震中距可能有关, 强震震级越大, 时间间隔愈短, 距离越近, 则小震活动速率增加明显, 相对应的地震强度较大。

关键词: 强震活动, 小震活动速率, z值, b值, 新疆天山地区

Abstract: There have been 5 earthquakes with magnitude above M_S7.0 since 2000 in Xinjiang and its surrounding areas. After these strong earthquakes, local stress in Xinjiang will be redistributed, which lead to the increase of the rate of small earthquakes activities in some areas, Such as Urumqi in Xinjiang Tianshan seismic zone, in which small earthquakes with magnitude above MS 1.6 raised after the 21 March 2008 M_S7.3 Yutian, Xinjiang earthquake. Through the analysis of space-time scanned images for z-value and b-value in these regions affected by strong earthquake activities. The research results show that: ① The change of negative z-value and b-value area is consistent before and after strong earthquakes. ② A preliminary study suggests that the increase of small earthquake activity rate for local area and its forthcoming moderate earthquake, which are related to the magnitude of strong earthquake and epicenter distance, the greater the magnitude of strong earthquake, the shorter the time interval, the closer the distance, then the rate of small earthquake activities increases more obviously, and the intensity of its corresponding medium-earthquake is likely to be greater.

Key words: Strong earthquakes, Small earthquake activity rate, z-value, b-value, Xinjiang region

中图分类号:

P315.7

张琳琳, 唐兰兰. 新疆及周边5次M_S7.0以上地震对天山地区小震活动的影响[J]. 地震, 2018, 38(4): 159-171.

ZHANG Lin-lin, TANG Lan-lan. Influence of Five M_S7.0 earthquakes on Small Earthquake Activities in Xinjiang and its Surrounding Areas[J]. EARTHQUAKE, 2018, 38(4): 159-171.

参考文献

[1] 梅世蓉, 薛艳, 宋治平. 汶川8.0级与昆仑山口西8.1级地震前地震活动异常特征与启示[J]. 地震, 2009, 29 (1): 1-13.
[2] 梅世蓉. 地震前兆场物理模式与前兆时空分布机制研究(一)—坚固体孕震模式的由来与证据[J]. 地震学报, 1995, 17 (3): 273-282.
[3] 敖雪明, 龙海英, 王桂岭. 新疆天山近7级地震前震群活动的时空分布演化特征[J]. 地震, 2010, 30 (4): 124-132.
[4] Wyss M, Wiemer S. Change in the probability for earthquakes in southern California due to the Landers magnitude 7.3 earthquake[J]. Science, 2000, 290: 1334-1338.
[5] Yih-Min Wu, Ling-Yun Chiao. Seismic quiescence before the 1999 Chi-Chi, Taiwan, M_W7.6 earthquake[J]. Bull Seism Soc Am, 2006, 96(1): 321-327.
[6] 易桂喜, 闻学泽, 辛华, 等. 龙门山断裂带南段应力状态与强震危险性研究[J]. 地球物理学报, 2013, 56(4) : 1112-1120.
[7] 段华琛, 范长青, 许跃敏. b值计算及其在地震预测预报中的应用[J]. 地震学报, 1995, 17(4) : 487-492.
[8] 易桂喜, 闻学泽, 范军, 等. 由地震活动参数分析安宁河—则木河断裂带的现今活动习性及地震危险性[J]. 地震学报, 2004a, 26(3): 294-303.
[9] 易桂喜, 闻学泽, 徐锡伟. 山西断陷带太原—临汾部分的强地震平均复发间隔与未来危险段落研究[J]. 地震学报, 2004b, 26(4): 387-395.
[10] 张琳琳, 唐兰兰. 新疆天山地区b值时空变化特征[J]. 地震, 2015, 35(3): 94-101.
[11] Wiemer S. A software package to analyze seismicity: ZMAP[J]. Seism. Res. Lett., 2001, 72: 73-382.
[12] 肖龙. 新疆天山造山带地质构造研究进展—兼论陆间型造山带形成的五阶段模式[J]. 桂林工学院学报, 1999, 19(4): 315-320.
[13] 高朝军, 宋春燕, 张琳琳. 新疆新源、和静交界6.6级地震前后波速比异常特征研究[J].内陆地震, 2013, 27(2): 121-126.
[14] Wiemer S, Wyss M. Seismic quiescence before the Landers (M=7.3) and Big Bear (M=6.5) 1992 earthquakes[J]. Bull Seismic Soc Am, 1994, 84: 900-916.
[15] Aki K. Maximum likelihood estimate of b in the formula logn=a-bm and its confidence limits[J]. Bull Earthq Res Inst Tokyo Univ, 1965, 43: 237-239.
[16] 解朝娣, 朱元清, 雷兴林. 昆仑山口西8.1级地震的应力触发作用及对周边断层的影响[J]. 地震地磁观测与研究, 2012, 33(5/6): 93-97.
[17] 赵翠萍, 陈章立, 郑斯华, 等. 2003年9月27日中、俄、蒙边界M_S7.9地震震源机制及破裂过程研究[J]. 地震学报, 2005, 27(3): 237-249.
[18] 冀战波. 新疆及邻近地区强震震源破裂过程与动态应力触发应用研究[D]. 兰州: 兰州地震研究所, 2014: 46-49.
[19] 万永革, 沈正康, 盛书中, 等. 2008年新疆于田7.3级地震对周围断层的影响及其正断层机制的区域构造解释[J]. 地球物理学报, 2010, 53(2): 280-289.