eprintid: 1929 rev_number: 9 eprint_status: archive userid: 2 dir: disk0/00/00/19/29 datestamp: 2017-05-16 13:31:38 lastmod: 2017-05-16 13:31:38 status_changed: 2017-05-16 13:31:38 type: article metadata_visibility: show creators_name: Martinez-Garzon, Patricia creators_name: Vavrycuk, Vaclav creators_name: Kwiatek, Grzegorz creators_name: Bohnhoff, Marco creators_id: creators_id: vv@ig.cas.cz creators_id: kwiatek@gfz-potsdam.de creators_id: bohnhoff@gfz-potsdam.de corp_creators: Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany corp_creators: Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany corp_creators: Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany corp_creators: Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany title: Sensitivity of stress inversion of focal mechanisms to pore pressure changes subjects: MP6 subjects: RU1_1 subjects: SG divisions: IP13 full_text_status: none abstract: We investigate the sensitivity of stress inversion from focal mechanisms to pore pressure changes. Synthetic tests reveal that pore pressure variations can cause apparent changes in the retrieved stress ratio R relating the magnitude of the intermediate principal stress with respect to the maximum and minimum principal stresses. Pore pressure and retrieved R are negatively correlated when R is low (R < 0.6). The spurious variations in retrieved R are suppressed when R > 0.6. This observation is independent of faulting style, and it may be related to different performance of the fault plane selection criterion and variability in orientation of activated faults under different pore pressures. Our findings from synthetic data are supported by results obtained from induced seismicity at The Geysers geothermal field. Therefore, the retrieved stress ratio variations can be utilized for monitoring pore pressure changes at seismogenic depth in stress domains with overall low R. date: 2016-08 date_type: published publication: Geophysical Research Letters volume: 43 number: 16 publisher: American Geophysical Union pagerange: 8441-8450 id_number: doi:10.1002/2016GL070145 issn: 0094-8276 official_url: http://doi.org/10.1002/2016GL070145 access_IS-EPOS: limited owner: Publisher citation: Martinez-Garzon, Patricia and Vavrycuk, Vaclav and Kwiatek, Grzegorz and Bohnhoff, Marco (2016) Sensitivity of stress inversion of focal mechanisms to pore pressure changes. Geophysical Research Letters, 43 (16). pp. 8441-8450. DOI: https://doi.org/10.1002/2016GL070145