安康地区地形变资料同震形变波特征分析

张雪娟; 张创军; 王玥明; 邵若潼; 古云鹤

doi:10.19987/j.dzkxjz.2022-104

安康地区地形变资料同震形变波特征分析

doi: 10.19987/j.dzkxjz.2022-104

1.
陕西省地震局安康地震监测中心站，陕西安康 725029
2.
陕西省地震局，陕西西安 710068

基金项目: 陕西省地震局启航与创新课题（QC202009）资助。

详细信息

通讯作者:
张雪娟（1990-），女，助理工程师，主要从事地震监测与数据分析工作。E-mail：2235470499@qq.com

中图分类号: P315.72⁺5
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- 文章访问数: 76
- HTML全文浏览量: 62
- PDF下载量: 15
出版历程
- 收稿日期: 2022-06-28
- 修回日期: 2022-08-23
- 网络出版日期: 2022-09-19

Study on co-seismic deformation wave characteristics of crustal deformation observation records in Ankang area

1.
Ankang Earthquake Monitoring Center Station, Shaanxi Earthquake Agency, Shaanxi Ankang 725029, China
2.
Shaanxi Earthquake Agency, Shaanxi Xi’an 710068, China

摘要

摘要: 利用安康地区3个形变台2017—2020年地形变资料，对比分析6套形变仪器的映震能力，并从面波延迟时间、最大响应幅度及同震持续时间等方面系统探讨同震形变波的特征参数与震源参数的关系，获知形变仪器映震效能的影响因素和同震形变波的物理分布特征。结果表明：形变仪器的映震能力受仪器自身响应特性、地下介质特性及仪器系统误差等因素的影响；同震形变波物理分布特征表明面波延迟时间与震中距、同震响应最大幅度与震级、同震持续时间与震级及震中距之间存在一定的比例关系。
- 地形变 /
- 同震形变波 /
- 映震能力 /
- 物理分布特征
Abstract: Based on the observation records of deformation stations in Ankang area from 2017 to 2020, we compared and analyzed the earthquake-reflecting capacity of six sets of instruments, and systematically discussed the relationship between the source parameters and the characteristic parameters of co-seismic deformation wave from the delay time of surface wave, the biggest shock and duration, and obtained the influencing factors of the earthquake-reflecting capacity of deformation instruments and the physical distribution characteristics of co-seismic deformation wave. The result shows that the earthquake-reflecting capacity of instrument is related to the response characteristics and systematic error of instrument, the characteristics of underground medium; The physical distribution characteristics of co-seismic deformation wave show that there are linear or proportional distribution relationship in a certain degree between the delay time of surface wave and the epicenter distance of earthquakes, the biggest shock of co-seismic and magnitude, the duration time of co-seismic and magnitude and epicenter distance.
- crustal deformation /
- co-seismic deformation wave /
- earthquake-reflecting capacity /
- physical distribution characteristic

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图 1 安康地区3个形变台的布设位置图

Figure 1. Location of three deformation stations in Ankang area

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图 2 形变仪器地震震级与震中距对数关系图

（a）安康体应变仪；（b）安康VP仪；（c）平利水管仪；（d）平利伸缩仪；（e）宁陕体应变仪；（f）宁陕VP仪

Figure 2. Relationship between the magnitude M_s and the logarithm of epicenter distance of deformation instrument

（a） Body strain-meter of Ankang；（b） VP meter of Ankang；（c） Water tube tilt meter of Pingli；（d） Extensometer of Pingli；（e） Body strain-meter of Ningshan；（f） VP meter of Ningshan

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图 3 形变仪器面波延迟时间与震中距的关系图

（a）安康体应变仪；（b）安康VP仪；（c）平利水管仪；（d）平利伸缩仪；（e）宁陕体应变仪；（f）宁陕VP仪

Figure 3. Relationship between the delay time of surface wave recorded by deformation instrument and epicenter distance

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图 4 形变仪器同震响应最大幅度与震级的关系图

（a）安康VP仪NS；（b）安康VP仪EW；（c）平利水管仪NS；（d）平利水管仪EW；（e）平利伸缩仪NS；（f）平利伸缩仪EW；（g）宁陕体应变仪

Figure 4. Relationship between the maximum amplitude of co-seismic response recorded by deformation instrument and earthquake magnitude

（a） VP meter of Ankang (NS)；(b) VP meter of Ankang (EW)；(c) Water tube tilt meter of Pingli (NS)；(d) Water tube tilt meter of Pingli (EW)；(e) Extensometer of Pingli (NS)；(f) Extensometer of Pingli (EW)；(g) Body strain-meter of Ningshan

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图 5 形变仪器同震持续时间与震级的关系图

（a）安康体应变仪；（b）安康VP仪；（c）平利水管仪；（d）平利伸缩仪；（e）宁陕体应变仪；（f）宁陕VP仪

Figure 5. Relationship between the duration of co-seismic response recorded by deformation instrument and earthquake magnitude

(a) Body strain-meter of Ankang；(b) VP meter of Ankang；(c) Water tube tilt meter of Pingli；(d) Extensometer of Pingli； (e) Body strain-meter of Ningshan；(f) VP meter of Ningshan

下载: 全尺寸图片幻灯片

图 6 形变仪器同震持续时间与震中距对数的关系图

（a）安康体应变仪；（b）安康VP仪；（c）平利水管仪；（d）平利伸缩仪；（e）宁陕体应变仪；（f）宁陕VP仪

Figure 6. Relationship diagram between the duration of co-seismic response recorded by deformation instrument and epicenter distance

(a) Body strain-meter of Ankang；(b) VP meter of Ankang；(c) Water tube tilt meter of Pingli；(d) Extensometer of Pingli； (e) Body strain-meter of Ningshan；(f) VP meter of Ningshan

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表 1 形变仪器及其地震记录情况

Table 1. Basic information and seismic record of deformation instrument

台站名	仪器信息	统计地震的时段	统计时段内地震事件总数/次
安康台	TJ-Ⅱ型体积式钻孔应变仪	2017-01—2020-12	109
安康台	VP型宽频带倾斜仪	2018-04—2020-12	625
平利台	DSQ型水管倾斜仪	2017-01—2020-12	395
平利台	SS-Y型铟瓦棒伸缩仪	2017-01—2020-12	42
宁陕台	TJ-Ⅱ型体积式钻孔应变仪	2017-01—2020-12	132
宁陕台	VP型宽频带倾斜仪	2019-10—2020-12	225

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表 2 形变仪器映震能力统计公式

Table 2. Statistic formula of earthquake-reflecting capacity of deformation instrument

形变仪器	映震能力统计公式
安康体应变仪	y = 1.2835lgx + 1.4356
安康VP仪	y = 1.6826lgx − 1.7659
平利水管仪	y = 1.8649lgx − 1.9568
平利伸缩仪	y = 1.6883lgx + 0.3112
宁陕体应变仪	y = 1.3354lgx + 1.1061
宁陕VP仪	y = 1.4343lgx − 0.4188
注：统计公式中x代表震中距（D），y代表震级（M_S）

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表 3 形变仪器在震中距11000—13000 km内可记录到的最小地震震级（M_S）

Table 3. The minimum magnitude (M_s) that can be recorded by deformation instrument within 11000—13000 km from the epicenter

形变仪器	震级（M_S）
形变仪器	D=11000 km	D=12000 km	D=13000 km
安康体应变仪	6.6	6.7	6.7
安康VP仪	5.0	5.1	5.2
平利水管仪	5.6	5.7	5.7
平利伸缩仪	7.1	7.2	7.3
宁陕体应变仪	6.5	6.6	6.6
宁陕VP仪	5.4	5.4	5.5
注：平利台和宁陕台距离安康台不超过100 km，故表中震中距计算均参考安康台

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