The evolving interaction of low-frequency earthquakes during transient slip
Por:
Frank, William B., Shapiro, Nikolai M., Husker, Allen L., Kostoglodov, Vladimir, Gusev, Alexander A., Campillo, Michel
Publicada:
1 abr 2016
Categoría:
Multidisciplinary
Resumen:
Observed along the roots of seismogenic faults where the locked
interface transitions to a stably sliding one, low-frequency earthquakes
(LFEs) primarily occur as event bursts during slow slip. Using an event
catalog from Guerrero, Mexico, we employ a statistical analysis to
consider the sequence of LFEs at a single asperity as a point process,
and deduce the level of time clustering from the shape of its
autocorrelation function. We show that while the plate interface remains
locked, LFEs behave as a simple Poisson process, whereas they become
strongly clustered in time during even the smallest slow slip,
consistent with interaction between different LFE sources. Our results
demonstrate that bursts of LFEs can result from the collective behavior
of asperities whose interaction depends on the state of the fault
interface.
Filiaciones:
Frank, William B.:
CNRS, Sorbonne Paris Cite, Inst Phys Globe Paris, Equipe Sismol, F-75238 Paris, France
MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
Shapiro, Nikolai M.:
CNRS, Sorbonne Paris Cite, Inst Phys Globe Paris, Equipe Sismol, F-75238 Paris, France
Inst Volcanol & Seismol FEB RAS, Petropavlovsk Kamchatski 683006, Russia
Husker, Allen L.:
Univ Nacl Autonoma Mexico, Inst Geofis, Ciudad De Mexico 04150, Mexico
Kostoglodov, Vladimir:
Univ Nacl Autonoma Mexico, Inst Geofis, Ciudad De Mexico 04150, Mexico
Gusev, Alexander A.:
Inst Volcanol & Seismol FEB RAS, Petropavlovsk Kamchatski 683006, Russia
Campillo, Michel:
MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
Univ Grenoble Alpes, CNRS, Inst Sci Terre, IRD, F-38610 Gieres, France
|