基于《中国震例》的地震空区和地震条带统计特征

地震 ›› 2016, Vol. 36 ›› Issue (4): 22-34.

基于《中国震例》的地震空区和地震条带统计特征

吕坚¹, 宋美琴², 周龙泉³, 邵志刚⁴, 徐甫坤⁵, 查小惠¹, 李金⁶

1.江西省地震局, 江西南昌 330039;
2.山西省地震局, 山西太原 030021;
3.中国地震台网中心, 北京 100045;
4.中国地震局地震预测研究所, 北京 100036;
5.云南省地震局, 云南昆明 650041;
6.新疆维吾尔自治区地震局, 新疆乌鲁木齐 830011

收稿日期:2015-07-04 发布日期:2020-07-03
作者简介:吕坚(1975-), 男, 江西寻乌人, 高级工程师, 主要从事地震活动性和数字地震学相关应用研究。
基金资助:
地震科技星火计划(XH16023)资助

Statistical Characteristics of Seismic Gaps and Seismic Belts Based on Earthquake Cases in China

LU Jian, SONG Mei-qin, ZHOU Long-quan, SHAO Zhi-gang, XU Fu-kuan, CHA Xiao-hui, LI Jin

1. Earthquake Administration of Jiangxi Province, Nanchang 330039, China;
2. Earthquake Administration of Shanxi Province, Taiyuan 030021,China;
3. China Earthquake Networks Center, Beijing 100045, China;
4. Institute of Earthquake Science CEA, Beijing 100036, China;
5. Earthquake Administration of YunnanProvince, Kunming 650041, China;
6. Earthquake Administration of Xinjiang Autonomous Region, Urumchi 830011, China

Received:2015-07-04 Published:2020-07-03

摘要/Abstract

摘要： 基于《中国震例》(1970—2013年), 系统清理了246次M≥5.0震例前的地震活动图像异常, 并结合区域差异进行地震空区和地震条带的统计特征研究。结果显示: ① 在246次震例中, 震前出现地震空区、地震条带的震例数分别为105次、 51次, 占震例总数的42.7%和20.7%; ② 随着主震震级的增大, 地震空区和地震条带出现的比例逐渐增大, 尤其是7级以上地震, 震前出现地震空区的震例数占同类震例总数的83.3%, 出现地震条带的震例数占同类震例总数的66.7%, 可见地震空区和地震条带可能是7级以上强震的重要异常判据; ③ 针对整个中国大陆及近海, 地震空区和地震条带的持续时间、展布尺度、起始震级与主震震级存在一定线性关系, 相关系数能够通过95%置信水平的阈值检验; ④ 各主要构造分区的统计结果差异较大, 青藏高原北部除地震空区持续时间外, 其余地震空区和地震条带参数与主震震级之间的线性关系均通过阈值检验, 南北带中南段和华北地区有个别参数通过检验, 天山地区所有参数均未通过检验。

关键词: 地震空区, 地震条带, 中国震例

Abstract: We re-sorted systematically seismicity pattern anomalies before 246 earthquakes (M≥5.0) according to Earthquake Cases in China (1970—2013), studied statistical characteristics of seismic gaps and seismic belts combined with regional differences. Our results show that, firstly, in these 246 earthquake cases, the number of seismic gaps and seismic belts before the earthquakes is 105 and 51 respectively, which account for 42.7% and 20.7% of the total earthquakes respectively. Secondly, the ratio of the seismic gaps and seismic belts appears to increase with the increase of main shock magnitude. Especially for earthquakes with M≥7.0, seismic gaps appeared before 83.3% earthquakes and seismic belts before 66.7% earthquakes, which indicate that seismic gap and the seismic belt maybe strong signals of earthquake with M≥7.0. In the whole of Chinese mainland and offshore area, there is a linear relationship among the duration time, distribution scale, initial magnitude of seismic gap and seismic strip, and the main shock magnitude, the correlation coefficient can pass the 95% confidence level threshold test. The statistical results of different tectonic divisions have large differences. The linear relationship between the parameters of seismic gap and seismic belt and magnitude of the main shock can pass the threshold value test apart from the duration time of seismic belt in the northern part of the Tibetan Plateau. Only a few parameters pass the threshold value test in the south section of the North-South Seismic Belt and north China, and all parameters in the Tianshan Mountains cannot pass the threshold value test.

Key words: Seismic gap, Seismic belt, Statistical characteristics, Earthquake Cases in China

中图分类号:

P315.7

吕坚, 宋美琴, 周龙泉, 邵志刚, 徐甫坤, 查小惠, 李金. 基于《中国震例》的地震空区和地震条带统计特征[J]. 地震, 2016, 36(4): 22-34.

LU Jian, SONG Mei-qin, ZHOU Long-quan, SHAO Zhi-gang, XU Fu-kuan, CHA Xiao-hui, LI Jin. Statistical Characteristics of Seismic Gaps and Seismic Belts Based on Earthquake Cases in China[J]. EARTHQUAKE, 2016, 36(4): 22-34.

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