Publikationsdatum:
2019
Beschreibung:
Abstract
In Mogul west of Reno, Nevada, USA in late February 2008 an earthquake sequence occurred that culminated in a magnitude 4.9 mainshock after a foreshock‐rich period lasting approximately 2 months on previously unidentified fault structures. In this article, we show that the foreshock sequence may have been driven by a fluid pressure intrusion. We use 1082 previously calculated earthquake focal mechanisms to infer the local stress field as well as 1408 relocated foreshock events to determine the required excess fluid pressure field in the source region of the Mogul earthquake sequence to trigger these events. A model of nonlinear pore‐pressure diffusion is used to model the fluid flow in a highly fractured subsurface. We find a strong correlation between high fluid pressure fronts and foreshock hypocenters, suggesting a natural fluid‐driven earthquake sequence.
Print ISSN:
2169-9313
Digitale ISSN:
2169-9356
Thema:
Geologie und Paläontologie
,
Physik