%0 Journal Article %1 henderson_etal:1999 %A Henderson, J. R. %A Barton, D. J. %A Foulger, G. R. %D 1999 %I Blackwell Science Ltd %J Geophysical Journal International %K geophysics seismology %N 2 %P 317--324 %R 10.1046/j.1365-246x.1999.00939.x %T Fractal clustering of induced seismicity in The Geysers geothermal area, California %U http://dx.doi.org/10.1046/j.1365-246x.1999.00939.x %V 139 %X We analyse earthquakes recorded at The Geysers geothermal field in California, an area where industrial activity induces seismicity. The seismicity is characterized by the seismic b-value and D, the fractal dimension of earthquake hypocentres measured from sliding windows containing 200 events. We study a group of events strongly clustered around an injection well. Over most of the time period examined we find a positive correlation between b and D. However, during the initiation of injection into a new well we find instead a negative correlation. The differences in correlation are statistically significant at the 1sigma level but only marginally so at the 2sigma level. These results provide evidence for a transient change in the seismic mechanisms operating, and may be explained by a change from conditions of slow stress loading to rapid loading as a result of the build-up of the rate of water injection into the reservoir.

@article{henderson_etal:1999, abstract = {We analyse earthquakes recorded at The Geysers geothermal field in California, an area where industrial activity induces seismicity. The seismicity is characterized by the seismic b-value and D, the fractal dimension of earthquake hypocentres measured from sliding windows containing 200 events. We study a group of events strongly clustered around an injection well. Over most of the time period examined we find a positive correlation between b and D. However, during the initiation of injection into a new well we find instead a negative correlation. The differences in correlation are statistically significant at the 1sigma level but only marginally so at the 2sigma level. These results provide evidence for a transient change in the seismic mechanisms operating, and may be explained by a change from conditions of slow stress loading to rapid loading as a result of the build-up of the rate of water injection into the reservoir.}, added-at = {2012-09-01T13:08:21.000+0200}, author = {Henderson, J. R. and Barton, D. J. and Foulger, G. R.}, biburl = {https://www.bibsonomy.org/bibtex/298f96e787e34b2ccb6758a791e6a644e/nilsma}, doi = {10.1046/j.1365-246x.1999.00939.x}, interhash = {ffb31f98af2da35f5f9e088de0fbadb2}, intrahash = {98f96e787e34b2ccb6758a791e6a644e}, journal = {Geophysical Journal International}, keywords = {geophysics seismology}, month = nov, number = 2, pages = {317--324}, publisher = {Blackwell Science Ltd}, timestamp = {2021-02-09T13:26:12.000+0100}, title = {Fractal clustering of induced seismicity in The Geysers geothermal area, California}, url = {http://dx.doi.org/10.1046/j.1365-246x.1999.00939.x}, volume = 139, year = 1999 }