Article(id=1322566900979188023, tenantId=1146029695717560320, journalId=1281212831689347082, issueId=1322566845215912204, articleNumber=null, orderNo=null, doi=10.14075/j.jgg.2025.02.056, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1740585600000, receivedDateStr=2025-02-27, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793254121298, onlineDateStr=2026-10-29, pubDate=1771084800000, pubDateStr=2026-02-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793254121298, onlineIssueDateStr=2026-10-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793254121298, creator=13701087609, updateTime=1793254121298, updator=13701087609, issue=Issue{id=1322566845215912204, tenantId=1146029695717560320, journalId=1281212831689347082, year='2026', volume='46', issue='2', pageStart='139', pageEnd='261', issueExtLink='null', onlineDate='null', pubDate='1771084800000', pubDateStr='2026-02-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793254108003, creator='13701087609', updateTime=1793254108003, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=194, endPage=200, ext={EN=ArticleExt(id=1322566901188903224, articleId=1322566900979188023, tenantId=1146029695717560320, journalId=1281212831689347082, language=EN, title=Water Level and Temperature Anomalies Preceding the 2016 Cangwu M5.4 Earthquake in Guangxi, columnId=null, journalTitle=Journal of Geodesy and Geodynamics, columnName=null, runingTitle=null, highlight=null, articleAbstract=

This study employs the probability density distribution method to extract and analyze high-frequency anomalies from digital water level and temperature records preceding the 2016 Cangwu M5.4 earthquake in Guangxi. The findings reveal: 1) Approximately 18 months pre-earthquake, five monitoring wells exhibited distinct high-frequency water-level anomalies demonstrating significant temporal synchronicity; 2) During 1-2 months prior to the event, two wells displayed pronounced short-term high-frequency anomalies, likely indicating a dynamic transition from regional stress accumulation to impending instability; 3) Spatially, anomalous points clustered predominantly along the SW direction of the epicenter, aligning with regional seismotectonic features. Most anomalies showed high spatial concentration consistent with the NW-SE oriented regional compressive stress field. This research establishes a viable methodology for identifying precursory anomalies in fluid monitoring data before moderate-to-strong earthquakes in south China.

, authors=Shuanglong QIN1, Ziyan WANG1, Chunheng YAN2, Peichan MO2, Xuan GONG3, Xuyu HONG1, *, authorsList=Shuanglong QIN, Ziyan WANG, Chunheng YAN, Peichan MO, Xuan GONG, Xuyu HONG, authorCompany=null, correspAuthors=Xuyu HONG, authorNote=null, correspAuthorsNote=null, copyrightStatement=All rights reserved. Unauthorized reproduction is prohibited., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322566903772594496, articleId=1322566900979188023, tenantId=1146029695717560320, journalId=1281212831689347082, language=CN, title=2016年广西苍梧5.4级地震前水位水温异常分析, columnId=1281933709121138897, journalTitle=大地测量与地球动力学, columnName=地球动力学, runingTitle=null, highlight=null, articleAbstract=

使用概率密度分布法提取2016年广西苍梧5.4级地震前数字化水位水温观测资料中的高频异常信息, 并进行分析。结果显示: 1)在震前约18个月, 有5口观测井的水位出现一定的高频异常, 且这些异常表现出显著的时间同步性; 2)震前1~2个月内, 有2口观测井水位出现明显的短临高频异常, 可能反映区域应力从积累到临震失稳的动态过程; 3)空间分布上, 异常点主要集中分布于震中SW方向, 与区域发震构造展布特征基本一致, 大部分异常点呈高度集中且与区域压应力方向(NW-SE)一致的特征。本文研究结果为华南地区中强地震前流体观测资料的前兆异常识别分析提供了一种可能的方法。

, authors=秦双龙1, 王紫燕1, 阎春恒2, 莫佩婵2, 龚萱3, 洪旭瑜1, *, authorsList=秦双龙, 王紫燕, 阎春恒, 莫佩婵, 龚萱, 洪旭瑜, authorCompany=null, correspAuthors=洪旭瑜, authorNote=

秦双龙, 工程师, 主要从事地下流体分析预报工作, E-mail:

, correspAuthorsNote=
洪旭瑜, 高级工程师, 主要从事地震前兆分析研究工作, E-mail:
, copyrightStatement=版权所有,未经授权,不得转载。, copyrightOwner=大地测量与地球动力学编辑部, extLink=null, articleAbsUrl=null, sourceXml=tkGp6rp3Gg5R0vPW286b+w==, magXml=+3Pmk2TbrUpcdSl0GuJEuA==, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=khdDSWprJB8M9/YVcxMrlA==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=34wPBGvWXlHly0785W+2mg==, mapNumber=null, fund=null)}, authors=[Author(id=1322566904259133772, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=slqin0624@126.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1322566904330436942, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, authorId=1322566904259133772, language=EN, stringName=Shuanglong QIN, firstName=Shuanglong, middleName=null, lastName=QIN, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1 Fujian Earthquake Agency, Fuzhou 350003, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1322566904418517327, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, authorId=1322566904259133772, language=CN, stringName=秦双龙, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1 福建省地震局, 福州, 350003, bio={"content":"

秦双龙, 工程师, 主要从事地下流体分析预报工作, E-mail:

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秦双龙, 工程师, 主要从事地下流体分析预报工作, E-mail:

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tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, language=EN, label=Fig. 3, caption=Time-distance relationship diagram of fluid high-frequency information anomaly before Cangwu M5.4 earthquake, figureFileSmall=PQVnfgYnYebCFt8LTR9Ucg==, figureFileBig=tsfeVBgXfbINffqHDUTFSw==, tableContent=null), ArticleFig(id=1322566908415689080, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, language=CN, label=图3, caption=苍梧5.4级地震前流体高频信息异常时间距离关系, figureFileSmall=PQVnfgYnYebCFt8LTR9Ucg==, figureFileBig=tsfeVBgXfbINffqHDUTFSw==, tableContent=null), ArticleFig(id=1322566908482797945, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, language=EN, label=Tab. 1, caption=

Data of digital water level and temperature observation wells within 500 km radius of the 2016 Cangwu M5.4 earthquake in Guangxi

, figureFileSmall=null, figureFileBig=null, tableContent=
序号省份测点经度/(°)纬度/(°)震中距/km观测手段基础资料观测质量影响因素预报评估综合评估
1广西九塘井108.6923.06314动水位、水温基本合格合格降雨合格A
2广西石埠井108.1822.82372静水位、水温基本合格合格降雨、周边河水基本合格B
3广西田东平一井107.1223.35455静水位、水温合格合格周边抽水基本合格B
4广西香1井107.0323.59464静水位、水温合格合格周边抽水基本合格B
5广西咸田井109.1521.42384静水位、水温合格合格降雨、海潮、海风合格A
6广西北海石康井109.3321.75344静水位、水温合格合格降雨、海潮、海风合格A
7广西西山井110.0622.39170动水位、水温合格合格降雨合格A
8广东信宜井110.9322.35202静水位、水温合格基本合格降雨合格A
9广东新丰江井114.6823.67320静水位、水温合格基本合格降雨基本合格B
10广东韶关井113.5824.85221静水位、水温合格基本合格降雨基本合格B
12广东深圳井114.1422.55313静水位、水温合格基本合格降雨基本合格B
13广东阳西井111.6021.78255静水位、水温合格合格降雨合格A
14广东阳江井111.9721.86250静水位、水温基本合格基本合格降雨基本合格C
15广东梅州井116.1424.32466静水位、水温合格基本合格降雨基本合格B
16湖南新宁清江井111.0326.6284动水位、水温合格合格降雨合格A
17湖南长沙井112.9228.17473动水位、水温合格合格降雨合格A
18海南火山流体井110.3519.98470静水位合格基本合格降雨基本合格B
19海南海口ZK26井110.3520.03465静水位、水温合格基本合格降雨、海潮基本合格B
20海南海口向荣井110.2819.98472静水位基本合格合格降雨基本合格B
21海南文昌潭牛井110.7319.68494静水位、水温基本合格合格降雨基本合格B
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2016年广西苍梧5.4级地震500 km范围内数字化水位水温观测井资料情况

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序号省份测点经度/(°)纬度/(°)震中距/km观测手段基础资料观测质量影响因素预报评估综合评估
1广西九塘井108.6923.06314动水位、水温基本合格合格降雨合格A
2广西石埠井108.1822.82372静水位、水温基本合格合格降雨、周边河水基本合格B
3广西田东平一井107.1223.35455静水位、水温合格合格周边抽水基本合格B
4广西香1井107.0323.59464静水位、水温合格合格周边抽水基本合格B
5广西咸田井109.1521.42384静水位、水温合格合格降雨、海潮、海风合格A
6广西北海石康井109.3321.75344静水位、水温合格合格降雨、海潮、海风合格A
7广西西山井110.0622.39170动水位、水温合格合格降雨合格A
8广东信宜井110.9322.35202静水位、水温合格基本合格降雨合格A
9广东新丰江井114.6823.67320静水位、水温合格基本合格降雨基本合格B
10广东韶关井113.5824.85221静水位、水温合格基本合格降雨基本合格B
12广东深圳井114.1422.55313静水位、水温合格基本合格降雨基本合格B
13广东阳西井111.6021.78255静水位、水温合格合格降雨合格A
14广东阳江井111.9721.86250静水位、水温基本合格基本合格降雨基本合格C
15广东梅州井116.1424.32466静水位、水温合格基本合格降雨基本合格B
16湖南新宁清江井111.0326.6284动水位、水温合格合格降雨合格A
17湖南长沙井112.9228.17473动水位、水温合格合格降雨合格A
18海南火山流体井110.3519.98470静水位合格基本合格降雨基本合格B
19海南海口ZK26井110.3520.03465静水位、水温合格基本合格降雨、海潮基本合格B
20海南海口向荣井110.2819.98472静水位基本合格合格降雨基本合格B
21海南文昌潭牛井110.7319.68494静水位、水温基本合格合格降雨基本合格B
), ArticleFig(id=1322566908667347323, tenantId=1146029695717560320, journalId=1281212831689347082, articleId=1322566900979188023, language=EN, label=Tab. 2, caption=

Abnormal information of water level and water temperature probability density in south China before the Cangwu M5.4 earthquake

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序号井孔震中距/km异常开始时间异常变化幅度异常出现距发震时间/d
1信宜井2022014-12-210.525 9588
2九塘井3142015-01-130.236 9565
3石埠井3722015-01-200.408 9558
4田东平一井4562015-02-200.399 6527
5新宁清江井2842015-05-110.478 0447
6西山井1702016-06-031.542 158
7北海石康井3442016-06-190.496 942
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苍梧5.4级地震前华南地区水位、水温概率密度异常信息

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序号井孔震中距/km异常开始时间异常变化幅度异常出现距发震时间/d
1信宜井2022014-12-210.525 9588
2九塘井3142015-01-130.236 9565
3石埠井3722015-01-200.408 9558
4田东平一井4562015-02-200.399 6527
5新宁清江井2842015-05-110.478 0447
6西山井1702016-06-031.542 158
7北海石康井3442016-06-190.496 942
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2016年广西苍梧5.4级地震前水位水温异常分析
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秦双龙 1 , 王紫燕 1 , 阎春恒 2 , 莫佩婵 2 , 龚萱 3 , 洪旭瑜 1, *
大地测量与地球动力学 | 地球动力学 2026,46(2): 194-200
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大地测量与地球动力学 |地球动力学 2026 , 46 (2) : 194 -200
2016年广西苍梧5.4级地震前水位水温异常分析
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秦双龙1 , 王紫燕1, 阎春恒2, 莫佩婵2, 龚萱3, 洪旭瑜1, *
作者信息
  • 1 福建省地震局, 福州, 350003
  • 2 广西壮族自治区地震局, 南宁, 530022
  • 3 广东省地震局, 广州, 510070
通讯作者:
洪旭瑜, 高级工程师, 主要从事地震前兆分析研究工作, E-mail:
作者简介:

秦双龙, 工程师, 主要从事地下流体分析预报工作, E-mail:

Water Level and Temperature Anomalies Preceding the 2016 Cangwu M5.4 Earthquake in Guangxi
Shuanglong QIN1 , Ziyan WANG1, Chunheng YAN2, Peichan MO2, Xuan GONG3, Xuyu HONG1, *
Affiliations
  • 1 Fujian Earthquake Agency, Fuzhou 350003, China
  • 2 Earthquake Agency of Guangxi Zhuang Autonomous Region, Nanning 530022, China
  • 3 Guangdong Earthquake Agency, Guangzhou 510070, China
出版时间: 2026-02-15 doi: 10.14075/j.jgg.2025.02.056
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使用概率密度分布法提取2016年广西苍梧5.4级地震前数字化水位水温观测资料中的高频异常信息, 并进行分析。结果显示: 1)在震前约18个月, 有5口观测井的水位出现一定的高频异常, 且这些异常表现出显著的时间同步性; 2)震前1~2个月内, 有2口观测井水位出现明显的短临高频异常, 可能反映区域应力从积累到临震失稳的动态过程; 3)空间分布上, 异常点主要集中分布于震中SW方向, 与区域发震构造展布特征基本一致, 大部分异常点呈高度集中且与区域压应力方向(NW-SE)一致的特征。本文研究结果为华南地区中强地震前流体观测资料的前兆异常识别分析提供了一种可能的方法。

苍梧5.4级地震  /  概率密度分布法  /  数字化水位水温  /  高频信息

This study employs the probability density distribution method to extract and analyze high-frequency anomalies from digital water level and temperature records preceding the 2016 Cangwu M5.4 earthquake in Guangxi. The findings reveal: 1) Approximately 18 months pre-earthquake, five monitoring wells exhibited distinct high-frequency water-level anomalies demonstrating significant temporal synchronicity; 2) During 1-2 months prior to the event, two wells displayed pronounced short-term high-frequency anomalies, likely indicating a dynamic transition from regional stress accumulation to impending instability; 3) Spatially, anomalous points clustered predominantly along the SW direction of the epicenter, aligning with regional seismotectonic features. Most anomalies showed high spatial concentration consistent with the NW-SE oriented regional compressive stress field. This research establishes a viable methodology for identifying precursory anomalies in fluid monitoring data before moderate-to-strong earthquakes in south China.

Cangwu M5.4 earthquake  /  probability density distribution method  /  digital water level and temperature  /  high-frequency information
秦双龙, 王紫燕, 阎春恒, 莫佩婵, 龚萱, 洪旭瑜. 2016年广西苍梧5.4级地震前水位水温异常分析. 大地测量与地球动力学, 2026 , 46 (2) : 194 -200 . DOI: 10.14075/j.jgg.2025.02.056
Shuanglong QIN, Ziyan WANG, Chunheng YAN, Peichan MO, Xuan GONG, Xuyu HONG. Water Level and Temperature Anomalies Preceding the 2016 Cangwu M5.4 Earthquake in Guangxi[J]. Journal of Geodesy and Geodynamics, 2026 , 46 (2) : 194 -200 . DOI: 10.14075/j.jgg.2025.02.056
概率密度函数作为一种统计学方法在多个领域内被广泛运用[1-7]。研究表明,概率密度分布法能有效提取地震前兆观测数据中的高频异常信息,但存在双重局限:1)研究对象多集中于强震(MS≥6.0)前的数字化水位、水温高频异常,而中强震(MS5.0~6.0)前兆特征研究较为缺乏;2)研究区域多聚焦于传统强震带,对少震弱震区的前兆响应机制验证不足。这在一定程度上制约了对地震前兆异常时空演化规律的认识。值得注意的是,华南板块北缘的广西地区2016年以来相继发生3次5级以上中强地震(2016年苍梧5.4级、2019年北流5.2级和靖西5.2级地震),打破了该区域历史少震弱震的特征,为检验概率密度分布法在中强震前兆识别中的适用性提供了案例研究。
本文选取2016年广西苍梧5.4级地震作为研究对象,基于概率密度分布法,分析震源区500 km范围内数字化水位、水温分钟值观测数据的高频异常特征。重点包括:1)通过提取震前数字化水位、水温的高频异常信息,研究其异常变化特征;2)分析异常的时空演化过程,并探讨其与地震发震构造的可能关联机制;3)综合异常空间丛集特征与已有震例研究成果,验证概率密度分布法在中强地震前兆识别中的适用性和可靠性。本文将概率密度法应用于华南少震弱震区(尤其广西弧形构造带)中强地震流体前兆识别,填补了该方法在弱构造活动区中强地震案例的系统研究空白,对完善区域前兆指标体系具有一定的科学意义。
2016-07-31 17:18广西苍梧县(24.08°N,111.56°E)发生5.4级地震,震源深度10 km,标志着华南沿海地震带结束了1999年以来长达17 a的5级以上地震平静期[8]。该地震具有以下典型特征:1)构造上位于贺街-夏郢断裂带西侧6 km,震源机制解显示为NNW向左旋走滑型破裂;2)主压应力P轴呈NW-SE向,与区域构造应力场一致;3)地震最大烈度Ⅵ度,未造成显著地表破坏[9]。该地震的特殊性在于其打破了华南沿海地区长期地震平静的背景,为研究该区中强地震的孕育过程提供了样本,特别是震前出现的流体异常变化,为该区中强地震的前兆特征研究提供了重要的基础。
面对TB级长时序观测数据,传统分析方法在异常信息提取效率与可靠性方面面临严峻挑战。华南地区是一个相对少震、弱震区,主要以4级地震为主,依据《华南地区地震预测指标体系》、《中国震例》及以往研究成果,该地区4.5级及以上地震流体前兆异常主要集中在250 km范围内,5级及以上地震主要集中在300 km范围内[10-13]。本文结合苍梧5.4级地震周边流体台站分布及资料,基于概率密度分布法在短临异常识别中的优势,选取震中500 km范围内观测资料质量较好、仪器系统运行稳定、综合评估可靠的21个水位及19个水温观测井分钟值数据进行分析,资料时间设定为震前2 a至震后0.5 a(2014-01-01—2016-12-31),资料具体情况见表 1。
在应用概率密度分布方法识别地震前兆异常前,首先需提取前兆观测数据中的高频成分。小波分析作为信号处理领域的重要方法,其核心优势在于通过多尺度基函数的灵活选择实现时频局部化分析[14]。与傅里叶变换的单一基函数不同,小波分析的基函数多样性(如Daubechies、Symlets等系列)使分析结果显著依赖于小波阶数的选择,这一特性在数字化前兆观测资料处理中的表现尤为突出[15-18]。研究表明,小波阶数的选择直接影响计算结果的稳定性与信号识别能力。低阶小波(1~2阶):时域分辨率高但频域局部化能力不足,导致计算结果振荡(标准差>15%);高阶小波(>6阶):频域分割精细但时域过度平滑,弱信号识别率下降40%以上;最优区间(3~6阶):在时频分辨率间取得平衡,计算结果稳定性(变异系数<5%)与异常检测灵敏度达到最优。
基于上述分析,本文选用误差较小的db5小波基滤波,并采用3~5阶分解对水位、水温观测数据进行高频信息提取(图 1),这一选择既考虑了小波光滑度与重构误差的平衡,也确保了高频信息提取的准确可靠[19-21]。前人已系统应用概率密度分布方法对2008年汶川8.0级、2013年芦山7.0级及2014年鲁甸6.5级地震前南北地震带水位、水温分钟值数据进行了深入分析,取得了显著的研究成果,关于其理论基础、计算原理及数学表达,本文不再赘述。
首先采用小波分析技术对原始数据进行趋势项去除和高频信息提取;随后运用概率密度分布方法对提取的高频信息进行计算分析,计算参数设置为窗长30 d、滑动步长3 d、db5滤波器、3~5阶分解。结果表明,在2016年苍梧5.4级地震发生前,共有7组水位数据检测到异常信息,异常检出率为33.33%,而水温数据未发现显著异常。具体异常信息见表 2。
图 2为基于概率密度分布方法提取的异常值曲线。可以看出,2016年苍梧5.4级地震前,震源区500 km范围内的数字化水位水温高频异常信息主要集中出现在2014-12—2016-06。其中,5个观测点呈现中期异常特征,包括信宜井静水位、田东平一井静水位、石埠井静水位、新宁清江井动水位和九塘井动水位;2个观测点表现为短期异常,分别为西山井动水位和北海石康井静水位。
从时空分布特征来看,最早出现异常的是距离震中202 km的信宜井静水位,异常起始于震前588 d;最晚出现异常的是距离震中344 km的北海石康井水位,异常出现在震前42 d,属短期异常。就空间分布而言,距离震中最远的异常点为田东平一井水位(距震中456 km),最近的为西山井动水位(距震中170 km)。
通过统计异常变化幅度、震中距与发震时间的相关关系(图 3)发现,异常出现时间与震中距之间无明显关联性;异常幅度与震中距之间也缺乏明确的线性依赖关系,尽管震中距较远的点位异常幅度呈弱衰减趋势,但因数据离散度较高,未能建立具有统计显著性的衰减模型(如指数/幂律模型)。上述现象主要归因于各观测点所处位置的水文地质条件空间异质性(如渗透性、储层结构的区域性差异)及构造位置对应力-应变响应的敏感性分异性特征等。
在异常变化特征方面,计算结果显示,概率密度分布异常主要表现为λ2上升和高值异常特征。从空间分布特征来看,异常点主要集中分布于震中SW方向,其空间展布与NE向发震构造具有良好的一致性。异常点呈广域分布但相对集中的特点,可能指示该区域在此时间段内存在较为集中的构造应力积累。值得关注的是,2016年苍梧5.4级地震后,广西地区地震活动显著增强。据不完全统计,该区域后续相继发生多次4级以上地震,包括2016-09-17来宾4.1级、2017-07-15南丹4.0级、2017-08-15靖西4.0级、2017-10-03靖西4.1级、2019-11-28靖西4.3级、2021-08-04德保4.8级及2021-09-11德保4.3级等中强地震活动,特别是2019-10-12北流5.2级和2019-11-25靖西5.2级地震的发生,可能反映了苍梧5.4级地震后区域构造应力调整的延续。这些后续地震活动的时空分布特征,为进一步研究区域构造应力场演化提供了重要观测依据。
地下流体因其对构造应力变化的响应灵敏,已成为国际地震学界公认的有效地震前兆预测指标。研究表明,在构造应力积累过程中,孕震区及周边介质发生的微动态变化可导致地下水物理化学参数的异常变化[22-24],这种异常响应与区域构造活动存在一定的成因关联,其时空演化特征能够有效反映地震孕育过程中构造应力的动态变化规律。最新研究进一步揭示,地下流体异常模式不仅具有前兆指示意义,也可为解析区域构造活动特征提供重要科学依据。孙小龙等[4]采用概率密度分布法对2008年汶川8.0级地震前南北地震带的水位水温数据进行了高频信息分析,结果表明,在地震发生前,该区域有30组数据呈现出λ2值显著升高的异常特征,这一现象被认为可能与观测区域地壳构造活动或应力水平的增强有关。通过对苍梧5.4级地震前水位、水温分钟值数据的高频信息进行概率密度方法提取分析,发现了类似现象:地震发生前,一些水位观测井资料的高频信息呈现出不同程度的趋势性上升异常。这一现象可能表明,异常观测点周围的地壳构造活动或应力水平有所增强。然而,异常幅度的变化可能受不同观测点水文地质条件及敏感度差异的影响,大多数水位异常观测点在震前约1.5 a已出现高频信息的高值异常,可能反映了局部构造活动或区域应力场逐渐增强的过程。郭培兰等[25]基于2016年苍梧5.4级地震系统分析了广西及邻区地下流体观测数据,发现6口观测井水位呈现出一定的前兆异常,而水温数据未见显著变化。
概率密度分布中的高频信息在流体异常分析中具有明确的物理含义,主要反映含水层系统对构造应力的瞬态响应过程,这一过程可分为3个关键阶段:1)应力驱动阶段,区域构造应力改变(加载/卸载)导致岩石微裂隙产生;2)裂隙动态响应阶段,裂隙发生瞬态扩展/闭合,产生孔隙压力脉冲;3)流体响应阶段,压力脉冲通过井-含水层系统传导,引发水位/水温的微振荡变化,在概率密度分布上表现为右偏厚尾特征(偏离正态分布),该过程具有典型的短临响应特征(秒-小时级),其物理本质是裂隙动力学过程,对临震应力变化速率敏感。
相比之下,传统趋势/破年变方法反映的是含水层系统对长期应力加载(月-年级)的响应,主要表现为含水层的准静态压缩调整,其物理机制是基于孔隙弹性理论[26]。2种方法在时间尺度、响应机制和敏感对象上存在显著差异。总体来说,概率密度分布方法在前兆资料应用分析上具有一定价值,至于水温未提取到高频异常信息,可能包括以下几种原因:1)传感器响应特性差异,水温探头典型频响范围为0.001~0.01 Hz(适用于缓慢热扩散过程),由于地震震级不大,难以捕捉地震孕育过程中产生的高频应力扰动;2)热惯性效应,水温变化受含水层热容量控制,其响应滞后于水位变化(可达72 h以上);3)探头位置局限,多数水温传感器布设在井筒底部,未能监测深部热流体运移关键层位。
莫佩婵等[27]基于高精度重力观测数据对桂东北地区2014—2016年重力场动态演化进行了系统分析。结果发现,在震前应力积累阶段,重力异常空间分布与区域布格重力异常呈显著一致性,沿贺街-夏郢断裂形成NNE向重力梯度带,且在震中区出现典型的“四象限”分布模式,这种有序性变化可能反映了区域应力增强导致的断层物质迁移和构造变形。同时,利用2013—2015年广西及邻区连续、流动GPS站观测资料,计算出该时段研究区面应变率与最大剪应变率,其中苍梧地区呈较弱的拉张膨胀,而震中附近地区表现为反向挤压收缩,面收缩率达到峰值(-3.2×10-8/a),2016年苍梧5.4级地震震中位于面应变梯度带零值过渡区;在距离震中74 km处的梧州地震台重力仪非潮汐观测数据在震前1 a出现趋势性转折变化,自2015-09中旬(震前10个月)起以平均10 μGal/月的速度持续上升10.5个月,累积变化105 μGal后,发生了苍梧5.4级地震。
多参数联合反演结果表明,流体高频异常、重力场变异与应变积累三者具有显著时空耦合性,共同揭示了苍梧5.4级地震前兆的异常特征。同时, 根据相关研究,苍梧5.4级地震的主要控制构造应为NNW贺街-夏郢断裂带,本次中强地震的流体异常范围分布相对较为广,绝大多数异常点在300 km范围以外。周依等[9]的研究成果显示,此次地震震中的桂东北地区地壳内部6 km深度处存在一个厚度达2 km的低速层,推测这个低速层可能是由结晶基底与上硅铝层之间的拆离滑脱所形成的韧性剪切带,这种地质结构为应力的传递提供了有利的环境,可能是本次地震300 km之外的流体观测井在地震前产生前兆异常的原因[28]。
孙小龙等[4]和王喜龙等[6-7]的研究都证实了概率密度分布法在提取强震(如汶川8.0级和芦山7.0级地震)前地下流体数字化观测数据高频异常信息方面的有效性,并指出其与构造应力活动增强的潜在关联。本文将这一方法应用于苍梧5.4级中强震前的水位、水温分钟值数据分析,同样观测到了震前部分水位数据高频信息呈现趋势性上升和短临的高值异常现象,印证了该方法在挖掘地下流体高频信息中蕴含的构造活动与应力变化信号方面的应用潜力。然而,相较于强震案例,本文中强震前兆的识别面临一系列独特挑战,方法的应用细节需结合数据特性进行深入考量,这主要包括:1)本文分析基于分钟值数据,虽然时间分辨率高,但数据量巨大且不可避免地包含更丰富的环境噪声(如抽水、降雨、仪器漂移、气压波动等高频干扰)。相较于强震显著且广泛的前兆异常,苍梧5.4级地震的流体前兆异常在幅度和数量上相对较弱,这使得有效信号(与构造活动相关的异常)更容易湮没在背景噪声中,信噪比问题尤为突出。2)观测到的水位高频信息异常表现为“不同程度的趋势性上升和短临的高值异常”,其绝对变化幅度和相对于背景值的偏离程度(即显著性)普遍小于汶川8.0级地震案例中的30组显著高值异常,这要求在识别阈值或判定异常时设定更精细的标准,以避免漏报(忽略真实弱异常)或虚报(将噪声误判为异常)。3)概率密度分析的效果比较依赖于关键参数的设置,如时间窗长度、滑动步长及小波分解的阶数等,这些参数设定直接影响对趋势变化的捕捉能力,如较长的窗长有利于平滑噪声、揭示长期趋势,但可能模糊短期瞬变信号;较短的窗长对短期变化敏感,但噪声干扰更大。步长决定了分析的时序分辨率,同时小波阶数决定了所提取高频信息的频率范围,不同阶数对应不同的频带,可能与不同物理过程(如浅层水文活动、深部裂隙扩展)相关,选择不当可能遗漏关键频段的异常或引入无关噪声。与强震案例不同,汶川8.0级地震的显著异常可能对参数设置相对不敏感,而本文面对更微弱信号的异常,参数设置的微小差异可能导致结果的显著不同,甚至决定能否识别出有效前兆异常。不同观测井水文地质条件的差异对异常表现的影响也可能需要更深入的剖析,以提升异常识别与物理解释的可靠性,因此未来的研究应着力于建立更精细的、适应弱信号环境及不同井孔特性的概率密度方法分析流程,并探索结合其他去噪或信息增强技术(如自适应滤波、多方法交叉验证)提高该方法在中强震乃至更小地震前兆监测中的实用性和预测效能。
本文利用概率密度分布方法,对2016年苍梧5.4级地震前震中500 km范围内的数字化水位、水温分钟值资料进行处理分析,提取了前兆高频异常信息,并对异常点的时空演化及变化特征进行分析,得出以下结论:
1) 在苍梧5.4级地震前,震中500 km范围内共有7个水位观测点出现了概率密度分布λ2高值异常,水温观测数据中未提取到显著异常,可能表明水位观测变化对该地区中强地震前兆响应更具指示意义,与华南地区历史震例统计结果基本吻合。
2) 高频信息异常点的时间演化特征显示,中期异常阶段(震前约1.5 a)有5口观测井水位出现同步性高频异常,反映区域构造应力的持续积累过程;短临异常阶段(震前1~2个月)有2口观测井的水位数“区域应力加载-断层局部失稳”的亚失稳地震前兆理论。
3) 高频信息异常点的空间分布特征显示,异常点呈现显著的构造控震分布格局,集中分布在沿震中SW方向的区域内,与发震构造走向基本一致,且异常点具有高度集中特征与区域主压应力方向(NW-SE)一致,可能指示了区域应力场的优势迁移方向。
4) 对高频信息的异常幅度与震中距及发震时间特征分析结果显示,异常出现时间与震中距及异常变化幅度与震中距之间,均未显示出显著的线性相关关系。尽管总体上震中距较远的点位异常幅度存在减小的趋势,但数据点整体离散度较大,这种高度的变异性导致未能建立显著的震中距-异常幅度衰减(如指数型)模型,主要归因于各观测点水文地质条件及其对区域构造应力敏感性的差异。
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2026年第46卷第2期
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doi: 10.14075/j.jgg.2025.02.056
  • 接收时间:2025-02-27
  • 首发时间:2026-10-29
  • 出版时间:2026-02-15
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  • 收稿日期:2025-02-27
基金
中国地震局震情跟踪课题(2023010304)
中国地震局震情跟踪课题(2024010305)
福建省地震局科研专项(Q202305)
中国地震局地震科技星火计划(XH23023YA)
中国地震局监测预报预警工作任务(CEA-JCYJ-202502014)
作者信息
    1 福建省地震局, 福州, 350003
    2 广西壮族自治区地震局, 南宁, 530022
    3 广东省地震局, 广州, 510070

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洪旭瑜, 高级工程师, 主要从事地震前兆分析研究工作, E-mail:
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https://castjournals.cast.org.cn/joweb/ddcl/CN/10.14075/j.jgg.2025.02.056
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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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