Rock fracture compliance derived from time delays of elastic waves
ABSTRACT The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through‐transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical sim...
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| Veröffentlicht in: | Geophysical Prospecting 2010-11, Vol.58 (6), p.1111-1122 |
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| container_title | Geophysical Prospecting |
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| creator | Möllhoff, M. Bean, C.J. Meredith, P.G. |
| description | ABSTRACT
The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through‐transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical simulations and analytical solutions. The focus is on deriving compliance from time delays. The influence of specimen and source transducer width was constrained using numerical wave simulations. We find that measured ultrasonic phase delays are better suited to estimate the fracture compliance than group delays. Using the frequency domain instead of the time domain increases the accuracy of the fracture compliance estimates. We further show that for cases where precise phase delay measurements are unavailable, employing first break times in conjunction with numerical simulations can be considered as an alternative. |
| doi_str_mv | 10.1111/j.1365-2478.2010.00887.x |
| format | Article |
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The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through‐transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical simulations and analytical solutions. The focus is on deriving compliance from time delays. The influence of specimen and source transducer width was constrained using numerical wave simulations. We find that measured ultrasonic phase delays are better suited to estimate the fracture compliance than group delays. Using the frequency domain instead of the time domain increases the accuracy of the fracture compliance estimates. We further show that for cases where precise phase delay measurements are unavailable, employing first break times in conjunction with numerical simulations can be considered as an alternative.</description><identifier>ISSN: 0016-8025</identifier><identifier>EISSN: 1365-2478</identifier><identifier>DOI: 10.1111/j.1365-2478.2010.00887.x</identifier><identifier>CODEN: GPPRAR</identifier><language>eng</language><publisher>Oxford, UK: Blackwell Publishing Ltd</publisher><subject>Applied geophysics ; Compliance ; Computer simulation ; Delay ; Earth sciences ; Earth, ocean, space ; Elastic waves ; Estimates ; Exact sciences and technology ; Fracture ; Fracture mechanics ; Group delay ; Internal geophysics ; Mathematical models ; Rock ; Time delay ; Transmission coefficient ; Ultrasonic</subject><ispartof>Geophysical Prospecting, 2010-11, Vol.58 (6), p.1111-1122</ispartof><rights>2010 European Association of Geoscientists & Engineers</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a5017-5a67f5d9a05530ca0722ea54ee952bb62dea74c4ffd96290a57fcb537fdf49013</citedby><cites>FETCH-LOGICAL-a5017-5a67f5d9a05530ca0722ea54ee952bb62dea74c4ffd96290a57fcb537fdf49013</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fj.1365-2478.2010.00887.x$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fj.1365-2478.2010.00887.x$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>315,781,785,1418,27929,27930,45579,45580</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23328915$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Möllhoff, M.</creatorcontrib><creatorcontrib>Bean, C.J.</creatorcontrib><creatorcontrib>Meredith, P.G.</creatorcontrib><title>Rock fracture compliance derived from time delays of elastic waves</title><title>Geophysical Prospecting</title><description>ABSTRACT
The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through‐transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical simulations and analytical solutions. The focus is on deriving compliance from time delays. The influence of specimen and source transducer width was constrained using numerical wave simulations. We find that measured ultrasonic phase delays are better suited to estimate the fracture compliance than group delays. Using the frequency domain instead of the time domain increases the accuracy of the fracture compliance estimates. We further show that for cases where precise phase delay measurements are unavailable, employing first break times in conjunction with numerical simulations can be considered as an alternative.</description><subject>Applied geophysics</subject><subject>Compliance</subject><subject>Computer simulation</subject><subject>Delay</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Elastic waves</subject><subject>Estimates</subject><subject>Exact sciences and technology</subject><subject>Fracture</subject><subject>Fracture mechanics</subject><subject>Group delay</subject><subject>Internal geophysics</subject><subject>Mathematical models</subject><subject>Rock</subject><subject>Time delay</subject><subject>Transmission coefficient</subject><subject>Ultrasonic</subject><issn>0016-8025</issn><issn>1365-2478</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNqNkEFPwzAMhSMEEmPwH3pBnDqcpGlaiQsgGCAEaBriGHlpImW060i6sf17UoZ2xhdb9nt-0kdIQmFEY13OR5TnImWZLEYM4hagKORoc0AG-8MhGQDQPC2AiWNyEsIcgIMQ2YDcTFr9mViPult5k-i2WdYOF9oklfFubap4a5ukc02_qXEbktYmcQid08k3rk04JUcW62DO_vqQvN_fTW8f0ufX8ePt9XOKAqhMBebSiqrEGMxBI0jGDIrMmFKw2SxnlUGZ6czaqsxZCSik1TPBpa1sVgLlQ3Kx-7v07dfKhE41LmhT17gw7SqoglMqMsFFVBY7pfZtCN5YtfSuQb9VFFRPTc1VD0f1cFRPTf1SU5toPf8LwaCxjmAW2oW9n3HOipL2EVc73berzfbf_9X4bRKHaE93dhc6s9nb0X-qXHIp1MfLWE3oE7xMs0JJ_gM5546M</recordid><startdate>201011</startdate><enddate>201011</enddate><creator>Möllhoff, M.</creator><creator>Bean, C.J.</creator><creator>Meredith, P.G.</creator><general>Blackwell Publishing Ltd</general><general>Blackwell</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>201011</creationdate><title>Rock fracture compliance derived from time delays of elastic waves</title><author>Möllhoff, M. ; Bean, C.J. ; Meredith, P.G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a5017-5a67f5d9a05530ca0722ea54ee952bb62dea74c4ffd96290a57fcb537fdf49013</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Applied geophysics</topic><topic>Compliance</topic><topic>Computer simulation</topic><topic>Delay</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Elastic waves</topic><topic>Estimates</topic><topic>Exact sciences and technology</topic><topic>Fracture</topic><topic>Fracture mechanics</topic><topic>Group delay</topic><topic>Internal geophysics</topic><topic>Mathematical models</topic><topic>Rock</topic><topic>Time delay</topic><topic>Transmission coefficient</topic><topic>Ultrasonic</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Möllhoff, M.</creatorcontrib><creatorcontrib>Bean, C.J.</creatorcontrib><creatorcontrib>Meredith, P.G.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Geophysical Prospecting</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Möllhoff, M.</au><au>Bean, C.J.</au><au>Meredith, P.G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Rock fracture compliance derived from time delays of elastic waves</atitle><jtitle>Geophysical Prospecting</jtitle><date>2010-11</date><risdate>2010</risdate><volume>58</volume><issue>6</issue><spage>1111</spage><epage>1122</epage><pages>1111-1122</pages><issn>0016-8025</issn><eissn>1365-2478</eissn><coden>GPPRAR</coden><abstract>ABSTRACT
The purpose of this study is to compare the reliability of various methods of estimating normal rock fracture compliance from elastic wave measurements. We compare ultrasonic through‐transmission laboratory measurements for a smooth fracture in a Westerly granite specimen with numerical simulations and analytical solutions. The focus is on deriving compliance from time delays. The influence of specimen and source transducer width was constrained using numerical wave simulations. We find that measured ultrasonic phase delays are better suited to estimate the fracture compliance than group delays. Using the frequency domain instead of the time domain increases the accuracy of the fracture compliance estimates. We further show that for cases where precise phase delay measurements are unavailable, employing first break times in conjunction with numerical simulations can be considered as an alternative.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/j.1365-2478.2010.00887.x</doi><tpages>12</tpages></addata></record> |
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| subjects | Applied geophysics Compliance Computer simulation Delay Earth sciences Earth, ocean, space Elastic waves Estimates Exact sciences and technology Fracture Fracture mechanics Group delay Internal geophysics Mathematical models Rock Time delay Transmission coefficient Ultrasonic |
| title | Rock fracture compliance derived from time delays of elastic waves |
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