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oa Scaled Energy for Natural and Induced Seismicity
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth EAGE Passive Seismic Workshop, Sep 2014, Volume 2014, p.1 - 3
Abstract
The relations between seismic moment M0 and seismic energy Es for various scale events were considered.
Averaging over the entire scale range gives relations close to the self-similar assumption. A more detailed examination reveals several hierarchical levels, in which changing the event parameters with the scale occurs by different laws, often strongly deviating from the self-similar scaling.
The first class of events is presented by small events with Mw <1 ÷ 2, located at shallow depths of about 1–2km. In this interval, the value of scaled energy Es/M0 regularly increases with the scale, which is related mainly to the dependence of rock shear modulus on scale. The second interval should include small earthquakes located at seismogenic depths. If hypocenters are confined to small cracks located aside from the central part of major faults, their parameters correspond to the self-similar laws and Es is proportional to M0. Earthquakes with moment magnitude Mw ~ 3.5–4 make the transition band, which is the boundary between the two ranges in which the scaling relations differ significantly.