Injection‐Induced Moment Release Can Also Be Aseismic

McGarr, A.; Barbour, Andrew J.

doi:10.1029/2018gl078422

Cited by 64 publications

(77 citation statements)

References 30 publications

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“…The cumulative moment and volumes at HF wells associated with induced earthquake sequences are in general agreement with the relationship identified by McGarr and Barbour (; Figure S10). Nearly all HF sequences had cumulative moments within the range expected for the volumes injected at the corresponding well with assumed shear moduli <30 GPa.…”

Section: Discussionsupporting

confidence: 88%

“…The most notable exception to this are the total volumes of fluids used in stimulating HF wells, which we obtained from FracFocus and by digitizing well records. Previously, volume of fluid injected at HF wells has been found to influence the likelihood of induced seismicity in Canada (Schultz et al, ) and could be associated with the maximum expected moment release (McGarr, ; McGarr & Barbour, ).…”

Section: Discussionmentioning

confidence: 99%

“…Nearly all HF sequences had cumulative moments within the range expected for the volumes injected at the corresponding well with assumed shear moduli <30 GPa. Our analysis only considered volumes injected at the individual HF well and therefore ignored the volume from other wells within 10 km that was considered by McGarr and Barbour (); if other nearby wells were considered in the volume calculation, there were would be a stronger agreement. From the McGarr and Barbour () relationship, a M > 4 earthquake could be a possibility for HF wells with volumes >~10 5 bbls.…”

Section: Discussionmentioning

confidence: 99%

“…Our analysis only considered volumes injected at the individual HF well and therefore ignored the volume from other wells within 10 km that was considered by McGarr and Barbour (); if other nearby wells were considered in the volume calculation, there were would be a stronger agreement. From the McGarr and Barbour () relationship, a M > 4 earthquake could be a possibility for HF wells with volumes >~10 5 bbls. Since a majority of HF wells associated with seismicity had volumes greater than this value, a M > 4 earthquake induced by HF could have been a possibility in Oklahoma if the McGarr and Barbour () relationship is applicable.…”

Section: Discussionmentioning

confidence: 99%

“…From the McGarr and Barbour () relationship, a M > 4 earthquake could be a possibility for HF wells with volumes >~10 5 bbls. Since a majority of HF wells associated with seismicity had volumes greater than this value, a M > 4 earthquake induced by HF could have been a possibility in Oklahoma if the McGarr and Barbour () relationship is applicable.…”

Section: Discussionmentioning

confidence: 99%

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Earthquakes Induced by Hydraulic Fracturing Are Pervasive in Oklahoma

et al. 2018

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Wastewater disposal is generally accepted to be the primary cause of the increased seismicity rate in Oklahoma within the past decade, but no statewide analysis has investigated the contribution of hydraulic fracturing (HF) to the observed seismicity or the seismic hazard. Utilizing an enhanced seismicity catalog generated with multistation template matching from 2010 to 2016 and all available hydraulic fracturing information, we identified 274 HF wells that are spatiotemporally correlated with bursts of seismicity. The majority of HF‐induced seismicity cases occurred in the SCOOP/STACK plays, but we also identified prominent cases in the Arkoma Basin and some more complex potential cases along the edge of the Anadarko Platform. For HF treatments where we have access to injection parameters, modeling suggests that poroelastic stresses are likely responsible for seismicity, but we cannot rule out direct pore pressure effects as a contributing factor. In all of the 16 regions we identified, ≥75% of the seismicity correlated with reported HF wells. In some regions, >95% of seismicity correlated with HF wells and >50% of the HF wells correlated with seismicity. Overall, we found ~700 HF‐induced earthquakes with M ≥ 2.0, including 12 events with M 3.0–3.5. These findings suggest state regulations implemented in 2018 that require operators in the SCOOP/STACK plays to take action if a M > 2 earthquake could have a significant impact on future operations.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Earthquakes Induced by Hydraulic Fracturing Are Pervasive in Oklahoma

et al. 2018

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A Harmonised Instrumental Earthquake Catalogue for Iceland and the Northern Mid-Atlantic Ridge

Jónasson

Bessason

Helgadóttir

et al. 2021

Preprint

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A comprehensive catalogue of historical earthquakes, with accurate epicentres and harmonised magnitudes is a crucial resource for seismic hazard mapping. Here we update and combine catalogues from several sources to compile a catalogue of earthquakes in and near Iceland, in the years 1900-2019. In particular the epicentres are based on local information, whereas the magnitudes are based on teleseismic observations, primarily from international online catalogues. The most reliable epicentre information comes from the catalogue of the Icelandic Meteorological Ofce, but this is complemented with information from several technical reports, scientic publications, and newspaper articles. The catalogue contains 1281 moment magnitude (M w ) ≥ 4 events, and the estimated completeness magnitude is M w 5.5 in the rst years, going down to M w 4.5 for recent years. The largest magnitude is M w 7.0. Such merging of local data and teleseismic catalogues has not been done before for Icelandic earthquakes, and the result is an earthquake map with much more accurate locations than earlier maps. The catalogue also lists 5640 additional earthquakes on the Mid-Atlantic Ridge, north of 43 • , with both epicentres and magnitudes determined teleseismically. When moment magnitudes are not available, proxy M w values are computed using χ 2 regression, normally on the surface-wave magnitude but exceptionally on the body-wave magnitude. Magnitudes of M w ≥ 4.5 have associated uncertainty estimates. The actual combined seismic moment released in the Icelandic earthquakes is found to be consistent with the moment estimated using a simple plate motion model, indicating that the seismic activity of the catalogue period might be typical of any 120-year time span. The catalogue is named ICEL-NMAR, and it is available online at http://data.mendeley.com (last access: 19 July 2021).

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