2020年10月22日四川北川<i>M</i><sub>S</sub>4.7地震强震动特征分析

江鹏; 李萍萍; 李同林; 温瑞智

doi:10.19975/j.dqyxx.2020-025

2020年10月22日四川北川M_S4.7地震强震动特征分析

doi: 10.19975/j.dqyxx.2020-025

1.
四川省地震局，成都 60041
2.
中国地震局工程力学研究所，哈尔滨 150080

基金项目: 地震科技星火计划资助项目（XH19038Y）

详细信息

作者简介:
江鹏（1987-），男，工程师，主要从事强震动观测和工程地震研究. E-mail：jiangpeng@scdzj.gov.cn

中图分类号: P315
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-16
- 录用日期: 2020-11-30
- 网络出版日期: 2021-09-13
- 刊出日期: 2021-03-01

Strong-motion recordings in M_S4.7 Beichuan, Sichuan earthquake on October 22, 2020

1.
Sichuan Earthquake Agency, Chengdu 610041, China
2.
Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Funds: Supported by the Science for Earthquake Resilience (Grant No.XH19038Y)

摘要

摘要: 2020年10月22日11时03分37秒四川省绵阳市北川县发生M_S4.7地震，四川强震动台网与预警烈度速报台网在震区建成较密集的台站，获取了532组三分量加速度记录，有助于开展区域地震动衰减和地震动特征研究. 本文对强震记录进行常规处理后计算出强震动记录的相关参数，利用克里金插值方法得到地震动峰值加速度PGA和峰值速度PGV的空间分布图，长轴呈北西—南东方向. 分析强震动记录PGA、PGV 随距离的衰减规律，与常用衰减关系预测值进行对比，此次地震 PGA 的衰减特性与俞言祥和汪素云（2006）提出的中国西部地区水平向基岩加速度衰减关系有较好的一致性. 北川M_S4.7地震获得的密集强震动记录为建立区域衰减关系，以及开展基于经验格林函数方法（EGFM）再现大震强地震动场展布等研究提供了重要的数据支撑.
- 北川地震 /
- 强震动记录 /
- 衰减关系
Abstract: On October 22, 2020, an earthquake with magnitude 4.7 occurred in Beichuan County, Sichuan Province. 532 sets of three-component acceleration records have been obtained by Sichuan strong motion network, which contribute to the study of regional ground motion attenuation and ground motion characteristics. After the conventional processing of strong motion records, the relevant parameters of strong motion records have been calculated. The spatial distribution maps of PGA and PGV are obtained by Kriging interpolation method, and the long axis is NE-SW direction. The attenuation law of PGA and PGV of strong motion records with distance is analyzed. Through comparison and analysis with three commonly used attenuation relationship prediction values, such as attenuation relationship of Eastern strong earthquake area established by the fifth generation zoning map, it can be seen that PGA and PGV of strong motion records are similar to those of this earthquake. The attenuation characteristics of the model are in good agreement with the attenuation relationship of horizontal bedrock acceleration proposed by Yu and Wang (2006). The dense strong motion records obtained from the Beichuan M_S4.7 earthquake provide important data support for establishing regional attenuation relationships and carrying out studies based on the empirical Green function method (EGFM) to reproduce the distribution of strong ground motions of large earthquakes.
- Beichuan earthquake /
- strong-motion recording /
- attenuation characteristic

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图 1 北川M_S4.7地震中获取记录的强震动台站分布图

Figure 1. Strong-motion stations recorded the Beichuan M_S4.7 earthquake

下载: 全尺寸图片幻灯片

图 2 强震动记录数量与震中距统计图

Figure 2. Statistical chart of the number of strong motion records and epicenter distance

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图 3 51BCB台站和51BCQ台站加速度时程与5% 阻尼比拟加速度反应谱

Figure 3. Acceleration time histories and 5%-damped pseudospectral accelerations for the recorded at stations 51BCB and 51BCQ

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图 4 PGA和PGV空间分布图

Figure 4. Contours for PGA and PGV

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图 5 PGA和PGV随震中距衰减分布

Figure 5. PGAs and PGVs attenuated with epicentral distance

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表 1 地震动记录及相关参数表

Table 1. Seismic records and related parameters

台站代码	纬度/(°)	经度/(°)	震中距/km	峰值加速度/（cm·s⁻²）			峰值速度/（cm·s⁻¹）			仪器烈度
台站代码	纬度/(°)	经度/(°)	震中距/km	EW	NS	UD	EW	NS	UD	仪器烈度
51BCB	31.8	104.2	2.9	−277.53	−250.72	103.51	3.54	4.12	0.98	7.1
B2603	31.9	104.1	10.9	158.11	180.88	142.52	−3.85	−4.28	1.66	6.7
B0571	31.7	104.3	12.5	156.39	152.27	84.13	2.81	−2.27	−1.76	6.2
U2302	31.8	104.0	18.8	−84.89	58.35	−113.25	−1.05	0.46	−1.51	5.7
B2607	32.0	104.2	21.5	30.62	23.74	21.00	1.11	1.11	0.68	4.7
B0502	31.7	104.4	24.8	23.86	10.06	19.62	−1.62	0.49	0.67	4.5
B2604	32.0	104.0	26.5	40.26	36.04	−35.32	−0.87	−0.95	0.72	4.8
51BCQ	31.8	104.5	26.7	11.81	7.34	6.59	0.36	0.22	0.19	3.1
B2608	31.9	104.5	27.3	71.05	46.59	20.26	−1.73	0.89	−0.42	5.5
51BCY	31.7	104.4	29.1	64.28	37.23	−18.70	1.07	−0.69	−0.27	5.0
U2310	31.8	103.9	30.3	39.08	−52.45	−30.54	0.51	−1.07	0.27	4.8
F8303	31.6	104.1	30.3	−53.09	57.13	27.28	−1.22	1.46	−0.62	5.1
B0501	31.6	104.3	31.4	44.66	−17.62	43.60	0.50	−0.40	−0.51	4.4
B2606	31.8	104.6	36.4	−59.36	−35.03	16.99	−2.36	−0.96	−0.37	5.4
B0503	31.6	104.4	38.1	−25.13	−9.91	−37.91	−0.79	0.54	−1.32	4.9
B2601	31.9	104.6	39.4	28.32	−23.96	9.10	−2.01	0.76	0.36	4.8
B2602	32.0	104.5	39.8	15.67	13.63	−12.76	−0.14	−0.16	−0.17	3.0
F8301	31.5	104.2	41.1	−15.99	−15.52	−6.07	0.53	−0.55	0.29	3.7
U2301	31.8	103.7	42.1	21.87	30.39	−29.72	−0.19	0.40	−0.10	3.9
B8112	31.7	104.6	42.8	−19.51	−13.82	−5.24	0.95	0.59	−0.30	4.1
B2713	32.2	104.5	46.3	16.53	17.99	8.34	−0.23	−0.32	0.14	3.4
U2306	31.9	103.7	46.6	24.66	34.78	35.83	−0.30	−0.37	0.17	3.9
B2703	32.1	104.5	47.6	46.73	48.69	−28.52	−0.19	−0.42	0.13	4.3
51MZX	31.4	104.2	48.0	6.60	−4.60	−3.28	−0.45	−0.30	−0.15	3.0
B8106	31.7	104.7	49.5	−6.32	11.61	−2.67	0.48	0.28	−0.13	3.2

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