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Article(id=1322940780612034780, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1322940717152215106, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2024.05.216, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1715184000000, receivedDateStr=2024-05-09, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793343261148, onlineDateStr=2026-10-30, pubDate=1744646400000, pubDateStr=2025-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793343261148, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793343261148, creator=13701087609, updateTime=1793343261148, updator=13701087609, issue=Issue{id=1322940717152215106, tenantId=1146029695717560320, journalId=1281212831689347082, year='2025', volume='45', issue='4', pageStart='331', pageEnd='440', issueExtLink='null', onlineDate='null', pubDate='1744646400000', pubDateStr='2025-04-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793343246019, creator='13701087609', updateTime=1793343246019, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=367, endPage=372, ext={EN=ArticleExt(id=1322940784441434334, articleId=1322940780612034780, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Anomaly Characteristics of Geoelectric Field before Jishishan MS6.2 Earthquake, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

By utilizing the method of dominant azimuth of the geoelectric field, an analysis of the dominant azimuth anomaly changes and characteristics was conducted on the geoelectric field data within a 400 km range of the epicenter of the 2023 Jishishan MS6.2 earthquake. The results show that the earliest anomaly before the earthquake occurred at the Guyuan station, which is located at the intersection of the Haiyuan fault and the Liupanshan fault. During the period of the anomaly, the Jingtai station, located in the middle section of the Haiyuan fault, also showed a rapid and significant deflection of the azimuth. The max azimuth α changes at both stations deviated from the normal background value by about 45°, which is considered a medium to short-term anomaly. The last anomaly to appear was at the Dawu station, located in the Bayan Har block, where the azimuth angle α showed a rapid deflection and jump, deviating from the normal background value by about 90°, which is considered a short-term anomaly. The number of three abnormal stations meets the prediction index system of the geoelectric field dominant azimuth. The evolution of the anomaly shows that the anomalies have quasi-synchronous characteristics in terms of appearance, duration, and end time. In terms of the distance from the epicenter, Guyuan station is the farthest, while Jingtai and Dawu stations are closer to the earthquake epicenter. Before the earthquake, due to the internal compression of the plate, the areas where the three geoelectric field stations are located and the surrounding stress compression changes were intense. When rocks were subjected to pressure and fracture, the fracture structure of the rock mass led to significant changes in the dominant azimuth of the geoelectric field in succession. The subsequent end of the three geoelectric fields anomaly after the earthquake also indirectly reflected the process of the gradual recovery of the rock mass fracture structure after stress release, indicating that the data changes of the three stations can truly reflect the changes in the underground medium.

, authors=Liqiong ZHANG1, Shude GAO1, Na LI1, authorsList=Liqiong ZHANG, Shude GAO, Na LI, authorCompany=null, correspAuthors=null, authorNote=

ZHANG Liqiong, senior engineer, majors in earthquake prediction and seismic electromagnetism, E-mail:

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利用大地电场优势方位角方法对2023年积石山MS6.2地震震中400 km范围内的地电场资料进行优势方位角异常变化和特征分析。结果显示，震前最早出现异常的是位于海原断裂和六盘山断裂交会处的固原台，异常持续期间位于海原断裂中段的景泰台也出现方位角快速、显著偏转，2个台站的方位角α变化均为偏离正常背景值最大约45°, 为中短期异常；最后出现异常的是位于巴颜喀拉地块的大武台，其方位角α出现快速偏转和突跳，偏离正常背景值最大约90°, 为短期异常。3个异常台站数量符合大地电场优势方位角预测指标体系，异常演化过程中呈现异常出现、持续和结束时间具有准同步性的特点。从震中距来看，固原台最远，景泰台和大武台更靠近地震震中，震前由于板块内部挤压，3个地电场台站所处区域及周边应力挤压变化剧烈，当岩石受压破裂时，岩体裂隙结构导致地电场优势方位角相继发生显著变化，而震后3个地电场异常相继结束也间接反映出应力释放后岩体裂隙结构逐渐恢复的过程，说明3个台站的资料变化可以真实反映地下介质的变化情况。

, authors=张丽琼1, 高曙德1, 李娜1, authorsList=张丽琼, 高曙德, 李娜, authorCompany=null, correspAuthors=null, authorNote=

张丽琼, 高级工程师, 主要从事地震预报及地震电磁学研究, E-mail:

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限于篇幅, 仅展示与异常台站相同极距和测项的优势方位角α变化图

, figureFileSmall=qWzr2D85a1Xt1E+eLlg/Bg==, figureFileBig=aZkm9oIBoe9JcXOFqK8nEg==, tableContent=null), ArticleFig(id=1322940801289953546, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322940780612034780, language=EN, label=Fig. 4, caption=Time process of geoelectric field anomalies before the Jishishan MS6.2 earthquake, figureFileSmall=qXK5orIF/voVfgh5368nTw==, figureFileBig=sSd+IDNo/0ILSQV9iTRSAg==, tableContent=null), ArticleFig(id=1322940801445142795, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322940780612034780, language=CN, label=图4, caption=积石山MS6.2地震前地电场异常时间进程, figureFileSmall=qXK5orIF/voVfgh5368nTw==, figureFileBig=sSd+IDNo/0ILSQV9iTRSAg==, tableContent=null), ArticleFig(id=1322940801499668748, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322940780612034780, language=EN, label=Tab. 1, caption=

Variation statistics of the dominant azimuths of the geoelectric fields within 400 km of the epicenter of the Jishishan MS6.2 earthquake

, figureFileSmall=null, figureFileBig=null, tableContent=
序号 台站 震中距/km 震前异常形态 异常开始时间 仪器观测时间 备注
1 兰州 104 无 - 2004-01-01 2021-12-31停测，改造为武胜驿台
2 武胜驿 137 无 - 2022-01-01
3 松山 169 无 - 2007-09-01 测区存在风力发电站干扰
4 黄羊 187 无 - 2007-06-11
5 古丰 192 无 - 2007-06-02 测区存在农户机械、用电和漏电等干扰
6 景泰 196 快速偏转，Δα≈45° 2023-05-20 2007-09-01
7 玛曲 199 无 - 2009-06-06 测区存在金矿、变电所和雷电等干扰
8 武威 200 无 - 2006-11-04
9 金银滩 214 无 - 2014-06-01
10 大武 269 偏转并突跳，Δα≈90° 2023-07-01 2013-10-01
11 固原 312 偏转并突跳，Δα≈45° 2023-03-01 2007-01-01
12 武都 330 无 - 2013-06-01 测区存在兰渝铁路、基建施工等干扰
13 平凉 353 无 - 2014-10-01
), ArticleFig(id=1322940801575166221, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322940780612034780, language=CN, label=表1, caption=

积石山MS6.2地震震中400 km范围地电场优势方位角变化统计

, figureFileSmall=null, figureFileBig=null, tableContent=
序号 台站 震中距/km 震前异常形态 异常开始时间 仪器观测时间 备注
1 兰州 104 无 - 2004-01-01 2021-12-31停测，改造为武胜驿台
2 武胜驿 137 无 - 2022-01-01
3 松山 169 无 - 2007-09-01 测区存在风力发电站干扰
4 黄羊 187 无 - 2007-06-11
5 古丰 192 无 - 2007-06-02 测区存在农户机械、用电和漏电等干扰
6 景泰 196 快速偏转，Δα≈45° 2023-05-20 2007-09-01
7 玛曲 199 无 - 2009-06-06 测区存在金矿、变电所和雷电等干扰
8 武威 200 无 - 2006-11-04
9 金银滩 214 无 - 2014-06-01
10 大武 269 偏转并突跳，Δα≈90° 2023-07-01 2013-10-01
11 固原 312 偏转并突跳，Δα≈45° 2023-03-01 2007-01-01
12 武都 330 无 - 2013-06-01 测区存在兰渝铁路、基建施工等干扰
13 平凉 353 无 - 2014-10-01
), ArticleFig(id=1322940801650663694, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322940780612034780, language=EN, label=Tab. 2, caption=

Variation characteristics of dominant azimuths of geoelectric fields before moderate-strong earthquakes

, figureFileSmall=null, figureFileBig=null, tableContent=
台站 地震 震中距/km 异常起始时间 异常开始至转折恢复时间/d 异常开始时间至发震时间/d 异常特征
大武 门源MS6.4 380 2015-10 150 111 方位角增大
夏河MS5.7 240 2019-06 174 146 方位角快速偏转
石渠MS5.6 200 2020-01 110 90 方位角快速偏转
积石山MS6.2 269 2023-08 276 138 方位角偏转并突跳
固原 积石山MS6.2 302 2023-03 327 288 方位角偏转并突跳，范围收窄
景泰 门源MS6.4 207 2015-11 230 82 方位角快速偏转
积石山MS6.2 196 2023-05 224 208 方位角快速偏转
), ArticleFig(id=1322940801738744079, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322940780612034780, language=CN, label=表2, caption=

中强地震前地电场优势方位角变化特征异常统计

, figureFileSmall=null, figureFileBig=null, tableContent=
台站 地震 震中距/km 异常起始时间 异常开始至转折恢复时间/d 异常开始时间至发震时间/d 异常特征
大武 门源MS6.4 380 2015-10 150 111 方位角增大
夏河MS5.7 240 2019-06 174 146 方位角快速偏转
石渠MS5.6 200 2020-01 110 90 方位角快速偏转
积石山MS6.2 269 2023-08 276 138 方位角偏转并突跳
固原 积石山MS6.2 302 2023-03 327 288 方位角偏转并突跳，范围收窄
景泰 门源MS6.4 207 2015-11 230 82 方位角快速偏转
积石山MS6.2 196 2023-05 224 208 方位角快速偏转
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积石山MS6.2地震前地电场异常特征
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张丽琼 1 , 高曙德 1 , 李娜 1
大地测量与地球动力学 | 地震地质 2025,45(4): 367-372
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大地测量与地球动力学 |地震地质 2025 , 45 (4) : 367 -372
积石山MS6.2地震前地电场异常特征
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张丽琼1 , 高曙德1, 李娜1
作者信息
  • 1 甘肃省地震局, 兰州市东岗西路450号, 730000
作者简介:

张丽琼, 高级工程师, 主要从事地震预报及地震电磁学研究, E-mail:

Anomaly Characteristics of Geoelectric Field before Jishishan MS6.2 Earthquake
Liqiong ZHANG1 , Shude GAO1, Na LI1
Affiliations
  • 1 Gansu Earthquake Agency, 450 West-Donggang Road, Lanzhou 730000, China

    • ZHANG Liqiong, senior engineer, majors in earthquake prediction and seismic electromagnetism, E-mail:

出版时间: 2025-04-15 doi: 10.14075/j.jgg.2024.05.216
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摘要
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利用大地电场优势方位角方法对2023年积石山MS6.2地震震中400 km范围内的地电场资料进行优势方位角异常变化和特征分析。结果显示，震前最早出现异常的是位于海原断裂和六盘山断裂交会处的固原台，异常持续期间位于海原断裂中段的景泰台也出现方位角快速、显著偏转，2个台站的方位角α变化均为偏离正常背景值最大约45°, 为中短期异常；最后出现异常的是位于巴颜喀拉地块的大武台，其方位角α出现快速偏转和突跳，偏离正常背景值最大约90°, 为短期异常。3个异常台站数量符合大地电场优势方位角预测指标体系，异常演化过程中呈现异常出现、持续和结束时间具有准同步性的特点。从震中距来看，固原台最远，景泰台和大武台更靠近地震震中，震前由于板块内部挤压，3个地电场台站所处区域及周边应力挤压变化剧烈，当岩石受压破裂时，岩体裂隙结构导致地电场优势方位角相继发生显著变化，而震后3个地电场异常相继结束也间接反映出应力释放后岩体裂隙结构逐渐恢复的过程，说明3个台站的资料变化可以真实反映地下介质的变化情况。

大地电场  /  积石山MS6.2地震  /  优势方位角  /  异常特征

By utilizing the method of dominant azimuth of the geoelectric field, an analysis of the dominant azimuth anomaly changes and characteristics was conducted on the geoelectric field data within a 400 km range of the epicenter of the 2023 Jishishan MS6.2 earthquake. The results show that the earliest anomaly before the earthquake occurred at the Guyuan station, which is located at the intersection of the Haiyuan fault and the Liupanshan fault. During the period of the anomaly, the Jingtai station, located in the middle section of the Haiyuan fault, also showed a rapid and significant deflection of the azimuth. The max azimuth α changes at both stations deviated from the normal background value by about 45°, which is considered a medium to short-term anomaly. The last anomaly to appear was at the Dawu station, located in the Bayan Har block, where the azimuth angle α showed a rapid deflection and jump, deviating from the normal background value by about 90°, which is considered a short-term anomaly. The number of three abnormal stations meets the prediction index system of the geoelectric field dominant azimuth. The evolution of the anomaly shows that the anomalies have quasi-synchronous characteristics in terms of appearance, duration, and end time. In terms of the distance from the epicenter, Guyuan station is the farthest, while Jingtai and Dawu stations are closer to the earthquake epicenter. Before the earthquake, due to the internal compression of the plate, the areas where the three geoelectric field stations are located and the surrounding stress compression changes were intense. When rocks were subjected to pressure and fracture, the fracture structure of the rock mass led to significant changes in the dominant azimuth of the geoelectric field in succession. The subsequent end of the three geoelectric fields anomaly after the earthquake also indirectly reflected the process of the gradual recovery of the rock mass fracture structure after stress release, indicating that the data changes of the three stations can truly reflect the changes in the underground medium.

geoelectric field  /  Jishishan MS6.2 earthquake  /  dominant azimuth  /  anomaly characteristics
张丽琼, 高曙德, 李娜. 积石山MS6.2地震前地电场异常特征. 大地测量与地球动力学, 2025 , 45 (4) : 367 -372 . DOI: 10.14075/j.jgg.2024.05.216
Liqiong ZHANG, Shude GAO, Na LI. Anomaly Characteristics of Geoelectric Field before Jishishan MS6.2 Earthquake[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (4) : 367 -372 . DOI: 10.14075/j.jgg.2024.05.216
正文
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2023-12-18甘肃省临夏州积石山县(102.79°N，35.7°E)发生MS6.2地震，震源深度10 km，地震距离最近的断层拉脊山北缘断裂约3 km。该区域位于中国南北地震带北部，属于青藏高原东北部的重要组成部分，震后发生多次余震，属于典型的主震-余震型地震。本次地震是甘肃省内自2013年岷县-漳县MS6.6地震以来发生的最大地震。为探究本次地震前是否观测到地电场异常信号，本文利用大地电磁优势方位角方法[1-2]，对地震前400 km范围内地电场资料的异常台站进行梳理，研究这些异常台站在震前的异常变化和特征，进而丰富地电场震例积累，为提升地电场前兆异常认识水平和对未来震情趋势研判提供参考。
1 异常台站简介
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积石山MS6.2地震前，震中400 km范围内分布有13个地电场观测台站。其中，平凉、武胜驿(原兰州)、武威、大武、景泰、金银滩和固原台地电场数据观测质量较高；玛曲、松山、古丰和武都台等观测环境较为复杂，受干扰影响程度大。
甘肃省、青海省和宁夏回族自治区地震局各相关专家利用大地电场优势方位角方法分析各台站数据，认为景泰、大武和固原3个台站的地电场观测数据的优势方位角存在异常变化。
1.1 大武台
大武地电场观测场地位于青海省果洛藏族自治州玛沁县大武镇，测区周围无高大建筑物、水库、湖泊和大型矿场等重大环境干扰源，在构造上位于东昆仑断裂带两侧约10 km。东昆仑断裂带是一条规模巨大、构造活动强烈的全新世活动断裂。该台使用ZD9A-2B地电场仪，采用多方向、多极距方法进行观测，布极方式为L型(图2(a))，分别为NS、EW和NE三个测向的长、短极距，共6道测线，其中NS、EW向长极距分别为175 m、150 m，短极距分别为150 m、100 m。
1.2 固原台
固原地电场观测场地位于宁夏自治区固原市彭堡乡，测区位于清水河压陷型盆地内。该盆地展布于香山-桃山、马东山-六盘山山脉、烟筒山-窑山和由南北古脊梁构成的残山丘陵、黄土丘陵之间。测区距离海原-六盘山断裂带约14 km，基本位于海原断裂末端和六盘山断裂交会区，东侧有NS走向的清水河断层通过，受青藏高原块体北东向推挤作用，该区域构造应力较强。该台使用GEF- Ⅱ型地电场仪，布极方式为L型(图2(b))，分别为NS、EW和NE三个测向的长、短极距，共6道测线，其中NS、EW向长极距为300 m，短极距为200 m，NE向长极距为424 m，短极距为282 m。
1.3 景泰台
景泰地电场观测场地位于甘肃省景泰县寺滩乡，测区场地地貌平坦开阔，为大面积的农田地，无大型水库和施工等重大环境干扰源，在构造上位于老虎山-毛毛山断裂北侧，与该断裂最近距离为17 km。该台使用ZD9A- Ⅱ型地电场仪，布极方式为L型(图2(c))，分别为NS、EW和NW三个测向的长、段极距，共6道测线，其中NS、EW向长极距为200 m，短极距为100 m。
2 资料分析及异常提取
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大地电场ET的优势方位角对异常的判定依据为[3]：在某一区域范围内(约400 km)或同一条断层附近，2个或多个地电场台站均出现优势方位角随机跳变范围或中间值发生偏转、发散等准同步的显著变化，变化范围在45°或90°左右，且持续时间在1周以上。
通过查阅台站观测日志、与台站观测人员核对及排查，使用地电场优势方位角方法对积石山MS6.2地震震中400 km范围内13个地电场台站的观测资料进行分析(表1)。
2.1 异常台站
从图3(e)可见，景泰台自2023-05下旬出现快速、显著偏转，于6月出现偏离正常背景值的发散异常，偏离正常背景值最大约45°，异常持续过程中发生积石山MS6.2地震。从图3(i)可见，大武台自2023-07出现快速偏转和突跳的异常变化，其偏转幅度偏离正常背景值范围最大为90°，偏转持续过程中发生积石山MS6.2地震。从图3(j)可见，固原台2023-01数据变化较为稳定，即Δα在40°左右的背景值跳变；但从3月开始，方位角出现快速且显著偏转，偏离正常背景值最大约45°，且呈现突跳范围收窄趋势，偏转持续至7月方位角又开始发散，10月再次呈现突跳范围收窄变化，随后于12月发生积石山MS6.2地震。
2.2 无异常台站
计算可知，武胜驿、黄羊、武威、金银滩和平凉台优势方位角变化较为平稳，无明显偏转、发散；松山、古丰、玛曲和武都台虽然优势方位角出现发散现象，但由于测区各类干扰因素影响较大(表1)，不易提取数据的异常特征，且干扰时间与数据变化存在同步性，变化可信度较低。
3 异常特征分析
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3.1 数量特征
震前出现3个前兆异常台站，符合大地电场优势方位角预测指标体系[3]。13个地电场台站的映震能力差异较大，可能是因为：1)台站观测数据质量影响。例如玛曲、松山、武都等台站观测环境较为复杂，观测数据本身质量不高，因此很难从观测数据中提取出显著的异常变化。2)台站位置处于应力不敏感地区[4]。马钦忠等[4]提出的“敏感点”是指，震中距不一定比其他点位小，但相对于其他点位却更容易显示异常效应的部位，从理论上可以解释为不同测点地下电性结构的差异性。如武胜驿、武威、平凉等台站观测环境良好，数据质量较高，但震前无异常变化出现。根据现有电性结构探测结果[5]分析，金银滩台处于柴达木地块，该地块表现出较厚且稳定的高阻地壳；武胜驿、武威和黄羊台处于祁连地块，该地块浅层断续发育与新生代盆地高、低电阻相间的盖层；平凉台位于鄂尔多斯盆地西侧，自地表到中下地区为较完整的高阻块体。3个异常台站均位于低阻区域，大武台位于巴颜喀拉地块内部的地壳上地幔，电性结构具有成层性，中、强地震的震中多位于地壳内低阻层的层段；固原台位于海原-六盘山断裂带，具有一定宽度和较直立的低阻异常带；景泰台所处的毛毛山-老虎山属于广义海原断裂的中段。可见，在积石山地震的孕育过程中，巴颜喀拉地块、海原-六盘山断裂带存在电性结构的改变，而柴达木地块、祁连地块和鄂尔多斯盆地均未记录到明显的电性结构变化。该现象与已有的研究结果一致[6]，从而证实了本次地震事件与3个地电场异常变化之间是存在一定相关性的。
3.2 时间特征
从时间演化来看，震前有1个台站出现地电场短期异常，2个台站出现地电场中短期异常。从异常进程来看，3个台站的异常均出现在震前，其中固原和景泰台出现异常至发震时间超过6个月，震后异常快速结束；大武台异常开始至发震时间最短，震后异常持续约3个月后结束(图4)。整个异常演化过程呈现出3个台站异常出现、持续和结束时间具有准同步性的特点。
3.3 形态特征
研究发现，利用地电场优势方位角计算强震前震中及附近地区的地电场资料，异常形态特征存在明显的重现性[2]。
大武台地电场资料在台站周边多次中强震前都出现过地电场优势方位角异常。异常形态主要表现为地电场优势方位角跳变、收缩和偏转等特点，地震多发生于异常时间持续4个月或异常恢复后3个月内，且当区域内几个台站出现准同步异常时，信度更高[7]。该台在积石山MS6.2地震前也出现过类似的异常形态(表2)，因此该台的异常变化信度较高，对判定地震要素具有较强的指示意义。景泰台地电场在2016年门源MS6.4地震前，优势方位角出现快速偏转的异常变化[8]。该台在积石山MS6.2地震前也出现了类似异常变化，因此该台也可以反映出震前的短期异常变化，对判定地震要素具有一定的参考意义。固原台地电场优势方位角为首次出现异常，并无以往震例信息，判定地震要素有待作积累。
4 讨论
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理论分析表明，孕震过程是应力不断加卸载的过程，岩体裂隙结构会随着应力的变化而变化[9]。而实际观测过程中，台站所处岩体结构差异会导致其裂隙结构对应力变化的响应产生差异，从而不同场地的岩体裂隙优势方位角是否发生显著变化也会出现不确定性[4-5]。
青藏高原东北缘区域发生大规模挤压隆升时，海原断裂带和东昆仑断裂的走滑运动也同期开始[10]，而本次地震就发生于快速隆升的积石山东缘断裂[11]。在青藏高原东北缘挤压显著增强的作用下，该地区主要处于NNW向挤压应力的环境。积石山MS6.2地震前，大地电场优势方位角最早出现异常的是位于海原断裂和六盘山断裂交会处的固原台，该台于2023-03优势方位角α的突跳范围出现大幅度发散，其大幅变化的物理机理可能是场地岩体裂隙结构在应力作用下发生改变。固原台异常持续期间，位于海原断裂中段的景泰台和东昆仑断裂的大武台也开始出现方位角的偏转发散，2个台站更靠近积石山MS6.2地震的震中。这就解释了地震前由于板块内部挤压，3个地电场台站所处区域及周边应力挤压变化剧烈，当岩石受压破裂时，岩体裂隙结构导致地电场优势方位角相继发生显著变化，该变化是真实存在的，反映了地下介质的变化。杨攀新等[12]在积石山MS6.2地震后，基于区域构造、历史地震活动和本次地震序列特点，指出震区后期发生更大地震的可能性不大，但由于拉脊山断裂带特殊的构造部位，该地震的发生进一步指示出该区域相邻构造单元的应力正在积累，尤其是邻近的西秦岭北缘断裂带和日月山断裂带的地震危险性值得进一步关注。本文的研究结果也显示，震后固原和景泰台地电场优势方位角快速恢复正常，而大武台地电场异常恢复缓慢，因此从侧面也反映出应力释放后岩体裂隙结构逐渐恢复的过程，这与发震构造研究结果相呼应。
5 结语
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积石山MS6.2地震前，固原、景泰和大武台地电场优势方位角出现异常变化。从震中距来看，固原台最远，景泰和大武台更靠近震中，因此区域构造背景和动力环境分析结果验证了震前由于板块内部挤压，3个地电场台站所处区域及周边应力挤压变化剧烈，当岩石受压破裂时，岩体裂隙结构导致地电场优势方位角相继发生显著变化；而震后3个地电场异常相继结束也间接反映出应力释放后岩体裂隙结构逐渐恢复的过程，说明3个台站的资料变化可以真实反映地下介质的变化情况。震前3个地电场资料的异常形态与以往震例研究存在明显的重现性，研究结果可以为震例总结和中强地震前异常分析工作提供借鉴。
综上所述，随着人类活动加剧和测区环境的不断复杂化，在依据地电场观测数据识别出地震电信号愈发困难时，利用岩体裂隙优势方位角方法，仍然可以反映出强震前的短期异常，对复杂环境条件下开展地电场短期预测研究具有一定应用价值。但在震后总结工作中，对于不同场地的岩体裂隙优势方位角是否发生显著变化，存在的不确定性和差异性还需要进行长期深入的研究。
基金
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  • 中国地震局地震科技星火计划(XH24047YA)
  • 地震科学联合基金(U2039206)
  • 中国地震局震情跟踪课题(CEA-ZQGZ-202501049)
  • 甘肃省地震局地震科技发展攻关项目(KY2203002)
文献
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Xu Yueren , Dou Aixia , Li Zhimin , et al. Rapid Assessment of Coseismic Hazards Induced by Jishishan MS6.2 Earthquake on December 18, 2023 in Gansu Province, Northwest China[J]. Earthquake, 2024, 44 (1): 209- 215
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2025年第45卷第4期
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doi: 10.14075/j.jgg.2024.05.216
  • 接收时间：2024-05-09
  • 首发时间：2026-10-30
  • 出版时间：2025-04-15
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  • 收稿日期：2024-05-09
基金
The Spark Program of Earthquake Technology of CEA(XH24047YA)
中国地震局地震科技星火计划(XH24047YA)
Joint Fund for Earthquake Science(U2039206)
地震科学联合基金(U2039206)
Seismic Regime Tracking Project of CEA(CEA-ZQGZ-202501049)
中国地震局震情跟踪课题(CEA-ZQGZ-202501049)
The Key Project of Seismological Research Fund of Gansu Earthquake Agency(KY2203002)
甘肃省地震局地震科技发展攻关项目(KY2203002)
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    1 甘肃省地震局, 兰州市东岗西路450号, 730000
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https://castjournals.cast.org.cn/joweb/ddcl/CN/10.14075/j.jgg.2024.05.216
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2种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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