新疆天山地区b值时空变化特征

地震 ›› 2015, Vol. 35 ›› Issue (3): 93-101.

新疆天山地区b值时空变化特征

张琳琳, 唐兰兰

新疆维吾尔自治区地震局, 乌鲁木齐 830011

收稿日期:2014-09-25 出版日期:2015-07-31 发布日期:2020-06-28
作者简介:张琳琳(1986-), 女, 河南商丘人, 工程师, 主要从事地震活动性和地震预测研究。
基金资助:
新疆地震科学基金(201404)资助

Temporal and Spatial Variations of b-value in Tianshan, Xinjiang

ZHANG Lin-lin, TANG Lan-lan

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

Received:2014-09-25 Online:2015-07-31 Published:2020-06-28

摘要/Abstract

摘要： 通过分析新疆天山中东段和南天山西段地区2000年以来的以最小完整性震级(Magnitude of completeness, M_c)下限为基础的b值时空扫描图像, 得到天山中东段和南天山西段两个不同区域的b值异常指标, 研究结果表明: ① 天山中东段地区b值背景为0.705±0.004; 南天山西段b值背景为0.583±0.003, 略低于天山中东段b值背景水平。 ② 2003—2012年研究区内4次6级以上地震前, 震中位置的b值多数处于低值状态, 而震中附近区域其b值相对较高, 反映出应力积累变化的主要方向。

关键词: b值, 天山中东段, 南天山西段

Abstract: We obtained anomaly index of b-value in the central and eastern Tianshan, the western section of southern Tianshan of Xinjiang through the analysis of space-time scanned images for b-value based on the lower limit of minimum Mc from 2000. The results show that (1) The background value of b-value in central and eastern Tianshan is 0.705 ± 0.004, and that for the western part of southern Tianshan is 0.583 ± 0.003, which is slightly below the background level of b-value in central and eastern Tianshan. (2) The b-values for the epicenter of the four earthquakes with magnitude above 6 in 2003~2012 are principally in a low level before the earthquakes, but those of the region around the epicenter are relatively high, which reflect the main direction of stress accumulation changes.

Key words: Variation of b-value, Central and eastern Tianshan, Western part of southern Tianshan

中图分类号:

P315.7

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): 93-101.

ZHANG Lin-lin, TANG Lan-lan. Temporal and Spatial Variations of b-value in Tianshan, Xinjiang[J]. EARTHQUAKE, 2015, 35(3): 93-101.

参考文献

[1] 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.
[2] 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.
[3] 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.
[4] 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.
[5] 易桂喜, 范军, 闻学泽. 由现今地震活动分析鲜水河断裂带中—南段活动习性与强震危险地段[J]. 地震, 2005, 25(1): 58-66.
[6] 易桂喜, 闻学泽, 王思维, 等. 由地震活动参数分析龙门山—岷山断裂带的现今活动习性与强震危险性[J]. 中国地震, 2006, 22(2): 117-125.
[7] 易桂喜, 闻学泽. 多地震活动性参数在断裂带现今活动习性与地震危险性评价中的应用与问题[J]. 地震地质, 2007, 29(2): 254-271.
[8] 易桂喜, 闻学泽, 苏有锦. 川滇活动地块东边界强震危险性研究[J]. 地球物理学报, 2008, 51(6): 1719-1725.
[9] Amorèse D, Grasso J R, Rydelek P A. On varying b-values with depth: results from computer-intensive tests for Southern California[J]. Geophys J Int, 2010, 180: 347-360.
[10] ChienChih Chen, WeiChien Wang, YoungFo Chang, et al. A correlation between the b-value and the fractal dimension from the aftershock sequence of the 1999 Chi-Chi, Taiwan, earthquake[J]. Geophys J Int, 2006, 167: 1215-1219.
[11] Wiemer S, Wyss M. Mapping the frequency-magnitude distribution in asperities: an improved technique to calculate recurrence time?[J]. J Geophys Res, 1997, 102: 15115-15128.
[12] Wiemer S, Wyss M. Minimum magnitude of complete reporting in earthquake catalogs: examples from Alaska, the Western United States and Japan[J]. Bull the Seism Soc Am, 2000, 90: 859-869.
[13] Wyss M, Sammis C G, Nadeau R M, et al. Fractal dimension and b-value on creeping and locked patches of the San-Andreas fault near Parkfield, California[J]. Bull the Seism Soc Am, 2004, 94: 410-421.
[14] Wyss M, Schorlemmer D, Wiemer S. Mapping asperities by minima of local recurrence time: the San Jacinto-Elsinore fault zones[J]. J Geophys Res, 2000, 105: 7829-7944.
[15] Zuniga R, Wyss M. Most- and least-likely locations of large to great earthquakes along the Pacific coast of Mexico estimated from local recurrence times based on b-values[J]. Bull the Seism Soc Am, 91: 1717-1728.
[16] 李全林, 陈锦标, 于渌, 等. b值时空扫描—监视破坏性地震孕育过程的一种手段[J]. 地球物理学报, 1978, 21(2): 101-123.
[17] 谢华章. b值数字模拟的再研究[J]. 华北地震科学, 1991, 9(1): 28-34.
[18] 高国英. 新疆大震前b值时空动态变化特征[J]. 内陆地震, 1997, 11(1): 34-39.
[19] 李正芳, 周本刚. 利用断裂带上的低b值识别凹凸体方法的探讨—以龙门山断裂带和鲜水河断裂带为例[J]. 震灾防御技术, 2014, 9(2): 213-225.
[20] 苏乃秦, 刘启泓, 龙海英. 新疆北天山中长期地震活动形式分析[J]. 内陆地震, 2001, 15(3): 201-210.
[21] 王琼, 曲延军, 聂晓红. 新疆北部构造区带地震活动状态分析[J]. 西北地震学报, 2011, 33(2): 137-142.
[22] 曲延军, 王琼, 聂晓红. 新疆南部构造区带与地震活动状态研究[J]. 内陆地震, 2010, 24(4): 298-305.
[23] 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.
[24] Schorlemmer D P, Wiemer S, Wyss M. Earthquake statistics at Parkfield: stationarity of b values[J]. J Geophys Res, 2004, 109: B12307.
[25] 朱艾斓, 徐锡伟, 甘卫军, 等. 鲜水河—安宁河—则木河断裂上可能存在的凹凸体: 来着背景地震活动性的证据[J]. 地震前缘, 2009, 16(1): 218-224.
[26] 王绍晋, 张建国, 余庆坤, 等. 红河断裂带的震源机制与现代构造应力场[J]. 地震研究, 2010, 33(2): 200-207.
[27] 罗荣联. 小区域的最大地震强度[J]. 地震研究, 1982, 5(4): 409-417.