基于重力观测的巴颜喀拉块体强震震级模拟分析

熊峰; 杨彦明; 庞博; 张小艳; 王旭东; 杨红樱

doi:10.3969/j.issn.2096-7780.2021.11.001

基于重力观测的巴颜喀拉块体强震震级模拟分析

doi: 10.3969/j.issn.2096-7780.2021.11.001

1.
内蒙古自治区地震局，呼和浩特 010010
2.
北京交通大学，北京 100044

基金项目: 内蒙古自治区地震局局长基金重点项目（2020JP03）资助。

详细信息

作者简介:
熊峰（1971-），女，高级工程师，主要从事内蒙古地球物理台网数据质量监控和形变监测工作。E-mail：13604715743@126.com

通讯作者:
杨彦明（1980-），男，高级工程师，主要从事地震监测方面的研究。E-mail: yym_2005@163.com

中图分类号: P315
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出版历程
- 收稿日期: 2021-09-25
- 修回日期: 2021-10-11

Simulation analysis of strong earthquake magnitude in Bayankala block based on gravity observation

1.
Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China
2.
Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 以内蒙古乌加河地震台的连续重力观测资料为基础，应用PET重力仪采样率较高的特点，分析了PET相对重力仪与JCZ-1甚宽带地震仪的波形相关关系及同震形变物理特征。通过模拟分析乌加河地震台PET相对重力仪记录到巴颜喀拉块体周围发生的6次7级以上强地震的同震P波、S波及面波与震中距离、震级的相关关系，得出一般震级模型、地应力波模型和S波P波幅度比模型公式。通过计算3种震级模型理论震级与实际震级的误差及相关系数R值，得到理论震级与实测震级标准误差达到0.04，R值达到0.99，验证了模型的可靠性。对比分析理论震级与实际震级的误差与R值，揭示同震形变波形蕴含地球动力特征的物理机制。
- 重力观测 /
- 巴颜喀拉块体 /
- 强震震级 /
- 同震形变 /
- 模拟分析
Abstract: Based on the continuous gravity observation data of Wujiahe seismic station in Inner Mongolia, the waveform correlation between PET relative gravimeter and JCZ-1 very broadband seismometer and the physical characteristics of coseismic deformation are analyzed using the high sampling rate of PET gravimeter. By simulating and analyzing the correlation between the coseismic P-wave, S-wave and surface wave with epicentral distance and magnitude of six strong earthquakes with M≥7 occurred around Bayankala block recorded by PET relative gravimeter at Wujiahe seismic station, the general magnitude model, in-situ stress wave model and S-wave P-wave amplitude ratio model are obtained. By calculating the error and correlation coefficient R value between the theoretical magnitude and the actual magnitude of the three models, the standard error between the theoretical magnitude and the measured magnitude is 0.04, and the R value is 0.99, which verifies the reliability of the model. The error and R value of theoretical magnitude and actual magnitude are compared and analyzed to reveal the physical mechanism of geodynamic characteristics contained in coseismic deformation waveform.
- gravity observation /
- Bayankala block /
- strong earthquake magnitude /
- coseismic deformation /
- simulation analysis

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图 1 台站与地震分布图

Figure 1. Distribution map of seismic station and earthquakes

下载: 全尺寸图片幻灯片

图 2 地震仪与重力仪地震波形对比

（a）速度波形；（b）加速度波形；（c）重力波形

Figure 2. Comparison of seismograph and gravimeter seismic waveforms

（a） Velocity waveform；（b） Acceleration waveform；（c） Gravity waveform

下载: 全尺寸图片幻灯片

图 3 面波延迟时间与震中距关系曲线及面波延迟时间与地应力波模型关系曲线

Figure 3. Relationship between surface wave delay time and epicentral distance and relationship between surface wave delay time and in-situ stress wave model

下载: 全尺寸图片幻灯片

图 4 一般性关系模型与震级拟合图

Figure 4. Fitting diagram of general relationship model and magnitude

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图 5 地应力波模型与震级拟合图

Figure 5. Fitting diagram of in-situ stress wave model and magnitude

下载: 全尺寸图片幻灯片

图 6 P波S波幅度比模型与震级拟合图

Figure 6. Fitting diagram of P-wave and S-wave amplitude radio model and magnitude

下载: 全尺寸图片幻灯片

表 1 重力仪记录到的地震波形参数

Table 1. Seismic waveform parameters recorded by gravimeter

序号	日期	发震时间	纬度/°N	经度/°E	震级（M_S）	参考位置	震中距/km	面波到时	面波延时/min
1	2008-03-21	06:33	35.6	81.6	7.4	新疆于田	2491.76	06:46	13
2	2008-03-24	04:56	35.8	81.6	5.2	新疆于田	2479.49	05:05	9
3	2008-07-24	03:54	32.8	105.6	5.6	陕西汉中	980.22	03:59	5
4	2008-05-25	16:21	32.6	105.4	6.4	四川广元	1008.86	16:26	5
5	2008-08-05	17:49	32.8	105.5	6.1	四川广元	983.81	17:54	5
6	2008-05-14	10:54	31.3	103.4	5.6	四川阿坝	1228.75	11:01	7
7	2010-04-14	07:49	33.2	96.6	7.3	青海玉树	1458.82	07:57	8
8	2012-06-30	05:07	43.4	84.7	6.6	新疆和田	1877.49	05:23	16
9	2012-08-12	18:47	35.9	82.6	6.3	新疆于田	2389.52	19:02	15
10	2013-04-20	08:02	30.3	103.0	7.0	四川芦山	1351.28	08:15	13
11	2014-02-12	17:19	36.1	82.5	7.3	新疆于田	2385.79	17:31	12
12	2015-07-03	09:07	37.6	78.2	6.5	新疆和田	2660.57	09:24	17
13	2017-01-28	02:46	27.9	103.3	5.7	四川凉山	1591.76	02:54	8
14	2017-06-33	18:11	38.0	103.6	5.0	内蒙古阿左旗	563.07	18:13	2
15	2017-08-08	21:19	33.2	103.8	7.0	四川阿坝州九寨沟	1013.18	21:25	6
16	2017-08-09	07:27	44.3	82.9	6.6	新疆精河	2000.50	7:38	11
17	2018-05-28	01:50	45.3	124.7	5.7	吉林松原	1496.92	1:59	9
18	2018-10-31	16:29	27.6	102.1	5.1	四川凉山	1674.71	16:39	10
19	2018-12-16	12:46	28.2	105.0	5.7	四川宜宾	1496.95	12:55	9
20	2021-05-22	02:04	34.59	98.3	7.4	青海玛多	1131.66	2:12	8

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表 2 模型震例参数表

Table 2. Earthquake parameters for the model

日期	参考位置	震级（M_S）	震中距/km	P波振幅 /（10⁻⁸ m•s⁻²）	S波振幅 /（10⁻⁸ m•s⁻²）	面波振幅 /（10⁻⁸ m•s⁻²）	面波周期/s
2008-03-21	新疆于田	7.4	2491.76	6006	15132	22492	12
2010-04-14	青海玉树	7.3	1458.82	3198	14113	61862	12
2013-04-20	四川芦山	7.0	1351.28	3202	4572	42647	12
2014-02-12	新疆于田	7.3	2385.79	5739	8571	25152	12
2017-08-08	四川阿坝九寨沟	7.0	1013.18	9207	15404	35536	13
2021-05-22	青海玛多	7.4	1217.00	23899	176197	215004	14

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