Rock and fault rheology explain differences between on fault and distributed seismicity.

ABSTRACT: Analysis of seismicity can illuminate active fault zone structures but also deformation within large volumes of the seismogenic zone. For the M_w 6.5 2016-2017 Central Italy seismic sequence, seismicity not only localizes along the major structures hosting the mainshocks (on-fault seismicity), but also occurs within volumes of Triassic Evaporites, TE, composed of alternated anhydrites and dolostones. These volumes of distributed microseismicity show a different frequency-magnitude distribution than on-fault seismicity. We interpret that, during the sequence, shear strain-rate increase, and fluid overpressure promoted widespread ductile deformation within TE that light-up with distributed microseismicity. This interpretation is supported by field and laboratory observations showin

SUBMITTER: Collettini C 

PROVIDER: S-EPMC9512795 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature