An Intense Quantum of Deformation in the Deep Crust As Seen from Geomechanical Modeling in Southern California

A rapidly developing high-amplitude shear deformation anomaly in the upper crustal interval (at depths of up to 10 km), the so-called “intense deformation quantum,” with a maximum increase in deformation by two orders of magnitude within half a month, has been identified within a geomechanical model of Southern California by detailed analysis of the local stress–strain features. These “quanta” can be integral elements of the entire deep deformation process associated with seismicity. The quantitative characteristics of deep deformation “quanta” and the conditions for their occurrence are discussed.