Intrusions and anomalous Vp/Vs ratios associated with the New Madrid seismic zone
Detailed P wave velocity (Vp) and S wave velocity (Vs) models and Vp/Vs ratios were determined for a major portion of the New Madrid seismic zone using arrival times recorded by the New Madrid seismic network and Portable Array for Numerical Data Acquisition (PANDA) stations. We performed a simultan...
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| Veröffentlicht in: | Journal of Geophysical Research: Solid Earth 2010-08, Vol.115 (B8), p.n/a |
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| creator | Powell, Christine A. Withers, Mitchell M. DeShon, Heather R. Dunn, Meredith M. |
| description | Detailed P wave velocity (Vp) and S wave velocity (Vs) models and Vp/Vs ratios were determined for a major portion of the New Madrid seismic zone using arrival times recorded by the New Madrid seismic network and Portable Array for Numerical Data Acquisition (PANDA) stations. We performed a simultaneous inversion for P and S wave velocities and hypocentral locations, yielding the most detailed tomographic image of the upper portion of the crust to date. Low Vp and high Vs anomalies resulted in low Vp/Vs ratios that correspond to the major arms of seismicity north of the intersection of the Cottonwood Grove–Blytheville Arch (CG‐BA) fault with the Reelfoot fault. The unusual low Vp/Vs values can be attributed to the presence of quartz‐rich rocks. Two regions contain anomalous Vp and Vs values and Vp/Vs ratios that cannot be attributed to variations in rock composition and are probably produced by overpressured fluids. One region is located on the hanging wall of the northern portion of the Reelfoot fault and is aseismic. The other region corresponds to a portion of the southern Reelfoot fault that experiences swarm activity. A distinct velocity contrast exists across the CG‐BA fault at depths exceeding 4.65 km; basement rocks southeast of the fault have Vp values that are 4%–6% slower than values for rocks located to the northwest. The most logical explanation is that the fault follows a preexisting structural feature or lithologic change in basement rocks. |
| doi_str_mv | 10.1029/2009JB007107 |
| format | Article |
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We performed a simultaneous inversion for P and S wave velocities and hypocentral locations, yielding the most detailed tomographic image of the upper portion of the crust to date. Low Vp and high Vs anomalies resulted in low Vp/Vs ratios that correspond to the major arms of seismicity north of the intersection of the Cottonwood Grove–Blytheville Arch (CG‐BA) fault with the Reelfoot fault. The unusual low Vp/Vs values can be attributed to the presence of quartz‐rich rocks. Two regions contain anomalous Vp and Vs values and Vp/Vs ratios that cannot be attributed to variations in rock composition and are probably produced by overpressured fluids. One region is located on the hanging wall of the northern portion of the Reelfoot fault and is aseismic. The other region corresponds to a portion of the southern Reelfoot fault that experiences swarm activity. A distinct velocity contrast exists across the CG‐BA fault at depths exceeding 4.65 km; basement rocks southeast of the fault have Vp values that are 4%–6% slower than values for rocks located to the northwest. The most logical explanation is that the fault follows a preexisting structural feature or lithologic change in basement rocks.</description><identifier>ISSN: 0148-0227</identifier><identifier>ISSN: 2169-9313</identifier><identifier>EISSN: 2156-2202</identifier><identifier>EISSN: 2169-9356</identifier><identifier>DOI: 10.1029/2009JB007107</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>Arrays ; Data acquisition ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Fault lines ; Faults ; Geophysics ; intraplate ; Mathematical models ; Plate tectonics ; Rheology ; Rocks ; S waves ; Seismic engineering ; Seismic phenomena ; Seismic zones ; Seismology ; seismotectonics ; tomography ; Wave velocity</subject><ispartof>Journal of Geophysical Research: Solid Earth, 2010-08, Vol.115 (B8), p.n/a</ispartof><rights>Copyright 2010 by the American Geophysical Union.</rights><rights>2015 INIST-CNRS</rights><rights>Copyright 2010 by American Geophysical Union</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2009JB007107$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2009JB007107$$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&idt=23233525$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Powell, Christine A.</creatorcontrib><creatorcontrib>Withers, Mitchell M.</creatorcontrib><creatorcontrib>DeShon, Heather R.</creatorcontrib><creatorcontrib>Dunn, Meredith M.</creatorcontrib><title>Intrusions and anomalous Vp/Vs ratios associated with the New Madrid seismic zone</title><title>Journal of Geophysical Research: Solid Earth</title><addtitle>J. Geophys. Res</addtitle><description>Detailed P wave velocity (Vp) and S wave velocity (Vs) models and Vp/Vs ratios were determined for a major portion of the New Madrid seismic zone using arrival times recorded by the New Madrid seismic network and Portable Array for Numerical Data Acquisition (PANDA) stations. We performed a simultaneous inversion for P and S wave velocities and hypocentral locations, yielding the most detailed tomographic image of the upper portion of the crust to date. Low Vp and high Vs anomalies resulted in low Vp/Vs ratios that correspond to the major arms of seismicity north of the intersection of the Cottonwood Grove–Blytheville Arch (CG‐BA) fault with the Reelfoot fault. The unusual low Vp/Vs values can be attributed to the presence of quartz‐rich rocks. Two regions contain anomalous Vp and Vs values and Vp/Vs ratios that cannot be attributed to variations in rock composition and are probably produced by overpressured fluids. One region is located on the hanging wall of the northern portion of the Reelfoot fault and is aseismic. The other region corresponds to a portion of the southern Reelfoot fault that experiences swarm activity. A distinct velocity contrast exists across the CG‐BA fault at depths exceeding 4.65 km; basement rocks southeast of the fault have Vp values that are 4%–6% slower than values for rocks located to the northwest. 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Withers, Mitchell M. ; DeShon, Heather R. ; Dunn, Meredith M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i2412-d63d55c8721d9e95e6aed902f5cbe55824fb4890320a288ae7222c4899b62403</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Arrays</topic><topic>Data acquisition</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Fault lines</topic><topic>Faults</topic><topic>Geophysics</topic><topic>intraplate</topic><topic>Mathematical models</topic><topic>Plate tectonics</topic><topic>Rheology</topic><topic>Rocks</topic><topic>S waves</topic><topic>Seismic engineering</topic><topic>Seismic phenomena</topic><topic>Seismic zones</topic><topic>Seismology</topic><topic>seismotectonics</topic><topic>tomography</topic><topic>Wave velocity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Powell, Christine A.</creatorcontrib><creatorcontrib>Withers, Mitchell M.</creatorcontrib><creatorcontrib>DeShon, Heather R.</creatorcontrib><creatorcontrib>Dunn, Meredith M.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>ProQuest Central (Corporate)</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>Agricultural & Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Engineering Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Engineering Database</collection><collection>Research Library (Corporate)</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Environmental Science Database</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>Environmental Science Collection</collection><collection>ProQuest Central Basic</collection><collection>Environment Abstracts</collection><jtitle>Journal of Geophysical Research: Solid Earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Powell, Christine A.</au><au>Withers, Mitchell M.</au><au>DeShon, Heather R.</au><au>Dunn, Meredith M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Intrusions and anomalous Vp/Vs ratios associated with the New Madrid seismic zone</atitle><jtitle>Journal of Geophysical Research: Solid Earth</jtitle><addtitle>J. Geophys. Res</addtitle><date>2010-08</date><risdate>2010</risdate><volume>115</volume><issue>B8</issue><epage>n/a</epage><issn>0148-0227</issn><issn>2169-9313</issn><eissn>2156-2202</eissn><eissn>2169-9356</eissn><abstract>Detailed P wave velocity (Vp) and S wave velocity (Vs) models and Vp/Vs ratios were determined for a major portion of the New Madrid seismic zone using arrival times recorded by the New Madrid seismic network and Portable Array for Numerical Data Acquisition (PANDA) stations. We performed a simultaneous inversion for P and S wave velocities and hypocentral locations, yielding the most detailed tomographic image of the upper portion of the crust to date. Low Vp and high Vs anomalies resulted in low Vp/Vs ratios that correspond to the major arms of seismicity north of the intersection of the Cottonwood Grove–Blytheville Arch (CG‐BA) fault with the Reelfoot fault. The unusual low Vp/Vs values can be attributed to the presence of quartz‐rich rocks. Two regions contain anomalous Vp and Vs values and Vp/Vs ratios that cannot be attributed to variations in rock composition and are probably produced by overpressured fluids. One region is located on the hanging wall of the northern portion of the Reelfoot fault and is aseismic. The other region corresponds to a portion of the southern Reelfoot fault that experiences swarm activity. A distinct velocity contrast exists across the CG‐BA fault at depths exceeding 4.65 km; basement rocks southeast of the fault have Vp values that are 4%–6% slower than values for rocks located to the northwest. The most logical explanation is that the fault follows a preexisting structural feature or lithologic change in basement rocks.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2009JB007107</doi><tpages>21</tpages></addata></record> |
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| subjects | Arrays Data acquisition Earth sciences Earth, ocean, space Exact sciences and technology Fault lines Faults Geophysics intraplate Mathematical models Plate tectonics Rheology Rocks S waves Seismic engineering Seismic phenomena Seismic zones Seismology seismotectonics tomography Wave velocity |
| title | Intrusions and anomalous Vp/Vs ratios associated with the New Madrid seismic zone |
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