Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 16, Pages 5847-5854Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL060948
Keywords
fluid injection induced seismicity; microearthquakes; wastewater disposal; pore pressure diffusion; fault zones; electrical resistivity tomography
Categories
Funding
- project Study of the Local Seismicity at the Osservatorio Ambientale della Val d'Agri (southern Italy)
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On 2 June 2006 the wastewater produced during the oil and gas field exploitation in High Agri Valley (southern Italy) started to be managed by disposal through pumping the fluids back into the subsurface at the Costa Molina 2 (CM2) injection well, located in the southeastern sector of the valley. The onset of microearthquakes (Ml2) after 4days at about 1.3km SW of CM2 well suggests fluid injection induced seismicity by the diffusion of pore pressure. Moreover, the space-time evolution of 196 high-resolution relocated events reveals a previously unmapped NE dipping fault. We investigate the physical processes related to the fluid injection induced seismicity and delineate the previously unmapped fault by jointly analyzing seismicity data, geological observations, fluid injection data, the stratigraphic log of the CM2 well, and the electrical resistivity tomography survey carried out in the study area.
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