Pamela Roselli published a paper entitled “Source mechanisms and induced seismicity in the Val d’Agri Basin (Italy)” in Geophysical Journal International. Pamela presents the results of a fully unconstrained moment tensor inversion of induced seismic events in a highly seismically vulnerable region of Val d’Agri basin, southern Italy. Our study area hosts two well-documented cases of induced microseismicity related to wastewater injection and strong seasonal level fluctuations of an artificial lake. The calculated moment tensors have significant non-double-coupling components that correlate with injection pressure at the wellhead. The injection parameters have a strong influence on the fracture mechanism, which can be interpreted as the opening/closing of a fracture network within a fault zone of a pre-existing overthrust. However, no direct correlations with reservoir loading/unloading are observed for reservoir-induced seismicity.
Reference:
Roselli, P., L. Improta, G. Kwiatek, P. Martínez-Garzón, G. Saccorotti, and A. M. Lombardi (2023). Source mechanisms and induced seismicity in the Val d’Agri Basin (Italy), Geophysical Journal International 234, no. 3, 1617–1627, DOI: 10.1093/gji/ggad155. [ Article Page ]