caa a22 4500 475814223 CHVBK 20180406123805.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1007/PL00001070 doi (NATIONALLICENCE)springer-10.1007/PL00001070 Dynamic Propagation and Interaction of a Rupture Front on a Planar Fault [Elektronische Daten] [E. Fukuyama, R. Madariaga] Abstrac: —We investigate the propagation and interaction of a rupture front that propagates on a planar fault using a boundary integral equation method. We show first that the rupture velocity is controlled by a delicate balance between consumed fracture energy and supplied elastic strain energy. A very sharp boundary in parameter space separates models in which ruptures stop spontaneously from those in which rupture propagates at super-shear speeds. The transition zone (or bifurcation) is shown to be stable with reference to small-scale heterogeneities of the stress field. Using the relations derived from this analysis we examined the mechanism to generate high slip rate when two rupture fronts collide. We found that collision at slow rupture velocities causes abrupt stress drop and generates high slip rates. However, these features tend to be moderated by large slip-weakening distances. Finally, we simulated rupture front focusing at the initial stages of an earthquake, a phenomenon that may cause high slip rate pulses and therefore generate high frequency seismic waves. We assume a pre-slip region, in which stress has decreased quasi-statically to the dynamic friction level. Due to this pre-slip, strong stress concentration has developed around the pre-slip area and a dynamic rupture starts at a certain point on the rim of the pre-slip region. We observe rupture front focusing that generates high slip rate pulses. We also studied a double pre-slip model, in which two pre-slip regions exist close to each other before the earthquake and found that multiple pre-slips enhance the focusing effects. Birkhauser Verlag Basel,, 2000 Key Words: Dynamic earthquake rupture, rupture front interaction, boundary integral equation method nationallicence Fukuyama E. National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan. E-mail: fuku@bosai.go.jp, JP aut Madariaga R. Laboratoire de Géologie, URA CNRS 1316, Ecole Normale Supérieure, Paris, France. E-mail: madariag@geologie.ens.fr, FR aut https://doi.org/10.1007/PL00001070 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/PL00001070 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fukuyama E. National Research Institute for Earth Science and Disaster Prevention, Tsukuba, Japan. E-mail: fuku@bosai.go.jp, JP aut NATIONALLICENCE 700 1- Madariaga R. Laboratoire de Géologie, URA CNRS 1316, Ecole Normale Supérieure, Paris, France. E-mail: madariag@geologie.ens.fr, FR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer