The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress

The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress

Since July 1994 an unusually persistent swarm of earthquakes (M

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of Geophysical Research 1997-07, Vol.102 (B7), p.15151-15161
Hauptverfasser: Sigmundsson, Freysteinn, Einarsson, Páll, Rögnvaldsson, Sigurdur Th, Foulger, G. R., Hodgkinson, K. M., Thorbergsson, Gunnar
Format: Artikel
Sprache:eng
Schlagworte:
Earth sciences
Earth, ocean, space
Earthquakes, seismology
Exact sciences and technology
Internal geophysics
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page 15161
container_issue B7
container_start_page 15151
container_title Journal of Geophysical Research
container_volume 102
creator Sigmundsson, Freysteinn
Einarsson, Páll
Rögnvaldsson, Sigurdur Th
Foulger, G. R.
Hodgkinson, K. M.
Thorbergsson, Gunnar
description Since July 1994 an unusually persistent swarm of earthquakes (M
doi_str_mv 10.1029/97JB00892
format Article
fullrecord <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_27391247</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>27391247</sourcerecordid><originalsourceid>FETCH-LOGICAL-a4646-6fd08416478fde033afcfe3bafcfa2bfdc07a8980b2735ff6bf177d85243b7813</originalsourceid><addsrcrecordid>eNp1kc-O0zAQhyMEEtWyB95gDggJiYDtOHHCjd2F7lYVsKjA0Zok49Td_OnarqC8EW-JS1e94YNnpPm-nzSaJHnO2RvORPW2UosLxspKPEpmgudFKgQTj5MZ47JMmRDqaXLu_YbFJ_NCMj5L_qzWBLyqZBq_HDxZP9jGhj3g2EJLZnIDBjuNgAFCZK9p7GzfQ3B22xNsdmNzGL-Gm4b66LyDlbNdR86OHUwGCF1Y3-_wjjzUexjsODkYsBsQ7Lihf3LsAOH3NNLBWE_Oxj5gD34ddfDBkffPkicGe0_nD_Us-fbxw-ryOl1-nt9cvl-mKAtZpIVpWSl5IVVpWmJZhqYxlNWHgqI2bcMUllXJaqGy3JiiNlyptsyFzGpV8uwseXnM3brpfkc-6MH6uFtcjqad11GruJAqgq-OYOMm7x0ZvXV2QLfXnOnDPfTpHpF98RCKvsHeOBwb60-CUGWV8zxi7Ij9tD3t_5-nF_OvF5wzWUQlPSrWB_p1UtDd6UJlKtc_Ps31F_V9sbzit_o2-wtagKkA</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>27391247</pqid></control><display><type>article</type><title>The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress</title><source>Wiley Free Content</source><source>Wiley-Blackwell AGU Digital Library</source><source>Wiley Online Library Journals Frontfile Complete</source><source>Alma/SFX Local Collection</source><creator>Sigmundsson, Freysteinn ; Einarsson, Páll ; Rögnvaldsson, Sigurdur Th ; Foulger, G. R. ; Hodgkinson, K. M. ; Thorbergsson, Gunnar</creator><creatorcontrib>Sigmundsson, Freysteinn ; Einarsson, Páll ; Rögnvaldsson, Sigurdur Th ; Foulger, G. R. ; Hodgkinson, K. M. ; Thorbergsson, Gunnar</creatorcontrib><description>Since July 1994 an unusually persistent swarm of earthquakes (M&lt;4.0) has been in progress at the Hengill triple junction, SW Iceland. Activity is clustered around the center of the Hrómundartindur volcanic system. Geodetic measurements indicate a few centimeters uplift and expansion of the area, consistent with a pressure source at 6.5±3 km depth beneath the center of the volcanic system. The system is within the stress field of the south Iceland transform zone, and the majority of the recorded earthquakes represent strike‐slip faulting on subvertical planes. We show that the secondary effects of a pressure source, modeled as a point source in an elastic half‐space, include horizontal shear that perturbs the regional stress. Near the surface, shear stress is enhanced in quadrants around the direction of maximum regional horizontal stress and diminished in quadrants around the direction of minimum regional stress. The recorded earthquakes show spatial correlation with areas of enhanced shear. The maximum amount of shear near the surface caused by the expanding pressure source exceeds 1 μstrain, sufficient to trigger earthquakes if the crust in the area was previously close to failure.</description><identifier>ISSN: 0148-0227</identifier><identifier>EISSN: 2156-2202</identifier><identifier>DOI: 10.1029/97JB00892</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>Earth sciences ; Earth, ocean, space ; Earthquakes, seismology ; Exact sciences and technology ; Internal geophysics</subject><ispartof>Journal of Geophysical Research, 1997-07, Vol.102 (B7), p.15151-15161</ispartof><rights>Copyright 1997 by the American Geophysical Union.</rights><rights>1997 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4646-6fd08416478fde033afcfe3bafcfa2bfdc07a8980b2735ff6bf177d85243b7813</citedby><cites>FETCH-LOGICAL-a4646-6fd08416478fde033afcfe3bafcfa2bfdc07a8980b2735ff6bf177d85243b7813</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F97JB00892$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F97JB00892$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,11493,27901,27902,45550,45551,46384,46443,46808,46867</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=2789515$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Sigmundsson, Freysteinn</creatorcontrib><creatorcontrib>Einarsson, Páll</creatorcontrib><creatorcontrib>Rögnvaldsson, Sigurdur Th</creatorcontrib><creatorcontrib>Foulger, G. R.</creatorcontrib><creatorcontrib>Hodgkinson, K. M.</creatorcontrib><creatorcontrib>Thorbergsson, Gunnar</creatorcontrib><title>The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress</title><title>Journal of Geophysical Research</title><addtitle>J. Geophys. Res</addtitle><description>Since July 1994 an unusually persistent swarm of earthquakes (M&lt;4.0) has been in progress at the Hengill triple junction, SW Iceland. Activity is clustered around the center of the Hrómundartindur volcanic system. Geodetic measurements indicate a few centimeters uplift and expansion of the area, consistent with a pressure source at 6.5±3 km depth beneath the center of the volcanic system. The system is within the stress field of the south Iceland transform zone, and the majority of the recorded earthquakes represent strike‐slip faulting on subvertical planes. We show that the secondary effects of a pressure source, modeled as a point source in an elastic half‐space, include horizontal shear that perturbs the regional stress. Near the surface, shear stress is enhanced in quadrants around the direction of maximum regional horizontal stress and diminished in quadrants around the direction of minimum regional stress. The recorded earthquakes show spatial correlation with areas of enhanced shear. The maximum amount of shear near the surface caused by the expanding pressure source exceeds 1 μstrain, sufficient to trigger earthquakes if the crust in the area was previously close to failure.</description><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Earthquakes, seismology</subject><subject>Exact sciences and technology</subject><subject>Internal geophysics</subject><issn>0148-0227</issn><issn>2156-2202</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNp1kc-O0zAQhyMEEtWyB95gDggJiYDtOHHCjd2F7lYVsKjA0Zok49Td_OnarqC8EW-JS1e94YNnpPm-nzSaJHnO2RvORPW2UosLxspKPEpmgudFKgQTj5MZ47JMmRDqaXLu_YbFJ_NCMj5L_qzWBLyqZBq_HDxZP9jGhj3g2EJLZnIDBjuNgAFCZK9p7GzfQ3B22xNsdmNzGL-Gm4b66LyDlbNdR86OHUwGCF1Y3-_wjjzUexjsODkYsBsQ7Lihf3LsAOH3NNLBWE_Oxj5gD34ddfDBkffPkicGe0_nD_Us-fbxw-ryOl1-nt9cvl-mKAtZpIVpWSl5IVVpWmJZhqYxlNWHgqI2bcMUllXJaqGy3JiiNlyptsyFzGpV8uwseXnM3brpfkc-6MH6uFtcjqad11GruJAqgq-OYOMm7x0ZvXV2QLfXnOnDPfTpHpF98RCKvsHeOBwb60-CUGWV8zxi7Ij9tD3t_5-nF_OvF5wzWUQlPSrWB_p1UtDd6UJlKtc_Ps31F_V9sbzit_o2-wtagKkA</recordid><startdate>19970710</startdate><enddate>19970710</enddate><creator>Sigmundsson, Freysteinn</creator><creator>Einarsson, Páll</creator><creator>Rögnvaldsson, Sigurdur Th</creator><creator>Foulger, G. R.</creator><creator>Hodgkinson, K. M.</creator><creator>Thorbergsson, Gunnar</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SM</scope><scope>8FD</scope><scope>FR3</scope></search><sort><creationdate>19970710</creationdate><title>The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress</title><author>Sigmundsson, Freysteinn ; Einarsson, Páll ; Rögnvaldsson, Sigurdur Th ; Foulger, G. R. ; Hodgkinson, K. M. ; Thorbergsson, Gunnar</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4646-6fd08416478fde033afcfe3bafcfa2bfdc07a8980b2735ff6bf177d85243b7813</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Earthquakes, seismology</topic><topic>Exact sciences and technology</topic><topic>Internal geophysics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sigmundsson, Freysteinn</creatorcontrib><creatorcontrib>Einarsson, Páll</creatorcontrib><creatorcontrib>Rögnvaldsson, Sigurdur Th</creatorcontrib><creatorcontrib>Foulger, G. R.</creatorcontrib><creatorcontrib>Hodgkinson, K. M.</creatorcontrib><creatorcontrib>Thorbergsson, Gunnar</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Earthquake Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><jtitle>Journal of Geophysical Research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sigmundsson, Freysteinn</au><au>Einarsson, Páll</au><au>Rögnvaldsson, Sigurdur Th</au><au>Foulger, G. R.</au><au>Hodgkinson, K. M.</au><au>Thorbergsson, Gunnar</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress</atitle><jtitle>Journal of Geophysical Research</jtitle><addtitle>J. Geophys. Res</addtitle><date>1997-07-10</date><risdate>1997</risdate><volume>102</volume><issue>B7</issue><spage>15151</spage><epage>15161</epage><pages>15151-15161</pages><issn>0148-0227</issn><eissn>2156-2202</eissn><abstract>Since July 1994 an unusually persistent swarm of earthquakes (M&lt;4.0) has been in progress at the Hengill triple junction, SW Iceland. Activity is clustered around the center of the Hrómundartindur volcanic system. Geodetic measurements indicate a few centimeters uplift and expansion of the area, consistent with a pressure source at 6.5±3 km depth beneath the center of the volcanic system. The system is within the stress field of the south Iceland transform zone, and the majority of the recorded earthquakes represent strike‐slip faulting on subvertical planes. We show that the secondary effects of a pressure source, modeled as a point source in an elastic half‐space, include horizontal shear that perturbs the regional stress. Near the surface, shear stress is enhanced in quadrants around the direction of maximum regional horizontal stress and diminished in quadrants around the direction of minimum regional stress. The recorded earthquakes show spatial correlation with areas of enhanced shear. The maximum amount of shear near the surface caused by the expanding pressure source exceeds 1 μstrain, sufficient to trigger earthquakes if the crust in the area was previously close to failure.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/97JB00892</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record>
fulltext fulltext
identifier ISSN: 0148-0227
ispartof Journal of Geophysical Research, 1997-07, Vol.102 (B7), p.15151-15161
issn 0148-0227
2156-2202
language eng
recordid cdi_proquest_miscellaneous_27391247
source Wiley Free Content; Wiley-Blackwell AGU Digital Library; Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection
subjects Earth sciences
Earth, ocean, space
Earthquakes, seismology
Exact sciences and technology
Internal geophysics
title The 1994-1995 seismicity and deformation at the Hengill triple junction, Iceland: Triggering of earthquakes by minor magma injection in a zone of horizontal shear stress
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-12T21%3A35%3A31IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=The%201994-1995%20seismicity%20and%20deformation%20at%20the%20Hengill%20triple%20junction,%20Iceland:%20Triggering%20of%20earthquakes%20by%20minor%20magma%20injection%20in%20a%20zone%20of%20horizontal%20shear%20stress&rft.jtitle=Journal%20of%20Geophysical%20Research&rft.au=Sigmundsson,%20Freysteinn&rft.date=1997-07-10&rft.volume=102&rft.issue=B7&rft.spage=15151&rft.epage=15161&rft.pages=15151-15161&rft.issn=0148-0227&rft.eissn=2156-2202&rft_id=info:doi/10.1029/97JB00892&rft_dat=%3Cproquest_cross%3E27391247%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=27391247&rft_id=info:pmid/&rfr_iscdi=true