eprintid: 1798 rev_number: 10 eprint_status: archive userid: 2 dir: disk0/00/00/17/98 datestamp: 2016-10-06 10:45:53 lastmod: 2017-02-08 12:21:40 status_changed: 2016-10-06 10:45:53 type: article metadata_visibility: show creators_name: Oye, Volker creators_name: Bungum, Hilmar creators_name: Roth, Michael corp_creators: NORSAR, Norway corp_creators: NORSAR, Norway corp_creators: NORSAR, Norway title: Source Parameters and Scaling Relations for Mining-Related Seismicity within the Pyhasalmi Ore Mine, Finland subjects: MP1 subjects: MP4 subjects: RFi1 subjects: SMU divisions: IP1 full_text_status: none abstract: To investigate source-scaling relations for small earthquakes (Mw −1.8 to 1.2) we have determined source parameters for numerous events (∼1500) from the 1400-m-deep Pyhäsalmi ore mine in Finland. In addition to a spectral integration approach, we have fitted Brune, Boatwright, and Haskell spectral-shape models to the observed spectra and investigated attenuation influences. Of three different constant Q models (200, 350, and 800), a Q of 350 in combination with the Brune spectral model satisfied the data best. We have also investigated the frequency dependence of Q using the spectral decay method and found that Q increases with frequency. For selected events from two distinct clusters, we compared source parameters derived from constant Q models with source parameters using the multiple empirical Green’s function (megf) approach. By using constant Q models, the apparent stress seems to increase with magnitude, whereas results based on the megf approach indicate constant apparent stress with magnitude. In comparison with results from other studies that cover a larger-magnitude scale, we find apparent stresses that are about 1 to 2 orders of magnitude smaller than most of those. A modified M0 ∼ fc−(3 + ϵ) scaling relation allows for increasing apparent stress with magnitude and can hence combine this study’s results with apparent stresses found for large earthquakes. However, within the limited-magnitude range of our data, apparent stresses seem constant. date: 2005-06 date_type: published publication: Bulletin of the Seismological Society of America volume: 95 number: 3 publisher: Seismological Society of America pagerange: 1011-1026 id_number: doi:10.1785/0120040170 issn: 0037-1106 official_url: http://doi.org/10.1785/0120040170 access_IS-EPOS: limited owner: Publisher citation: Oye, Volker and Bungum, Hilmar and Roth, Michael (2005) Source Parameters and Scaling Relations for Mining-Related Seismicity within the Pyhasalmi Ore Mine, Finland. Bulletin of the Seismological Society of America, 95 (3). pp. 1011-1026. DOI: https://doi.org/10.1785/0120040170