Mitsuhiro Matsu’ura

Regional Difference in Scaling Laws for Large Earthquakes and its Tectonic Implication

Abstract—We compiled 67 large earthquakes which occurred at and around plate boundaries for the last 140 yrs, and classified them into four groups; interplate strike-slip events, intraplate strike-slip events, underthrust events at island-arc subduction zones, and underthrust events at continental-margin subduction zones. For each group of earthquakes we examined relations between seismic moment M0, fault length L, fault width W and average fault slip D, and found the following scaling laws. In the case of interplate strike-slip events, the well-known L-cubed dependence of seismic moment breaks down when L exceeds 30 km, because the extent of the seismogenic zone is limited in depth (≤12 km). For large events (L≥ 30 km), D and M0 increase with L as

Quasi-Static Strain and Stress Fields due to a Moment Tensor in Elastic–Viscoelastic Layered Half-Space

D=\overline {\rm \Delta \tau}L /\mu (\alpha L+\beta )

Physics-Based 3-D Simulation for Earthquake Generation Cycles at Plate Interfaces in Subduction Zones

and

Characteristics of Viscoelastic Crustal Deformation Following a Megathrust Earthquake: Discrepancy Between the Apparent and Intrinsic Relaxation Time Constants

M_{0}=\overline {\rm \Delta \tau W}L^{2} / (\alpha L+\beta)

Computation Earthquake Physics PART II: Introduction

, respectively, where the mean fault width

Interplate seismogenic zones along the Kuril–Japan trench inferred from GPS data inversion

\overline {W}

Spontaneous Rupture Propagation on a Non-planar Fault in 3-D Elastic Medium

is 12 km and the mean stress drop

3-D Modelling of Plate Interfaces and Numerical Simulation of Long-term Crustal Deformation in and around Japan

\overline {\rm \Delta \tau}

The Mw 9.0 northeast Japan earthquake: total rupture of a basement asperity

is 1.8 MPa. Here μ, α and β are structural parameters. For intraplate strike-slip events we obtained nearly the same relations, except for significantly higher stress drop (3.1 MPa). The difference in stress drop between interplate and intraplate events may be ascribed to the difference in stress accumulation rates and thus the recurrence time of earthquakes. In the case of underthrust events at island-arc subduction zones we also found the saturation of fault width (

3-D physical modelling of stress accumulation processes at transcurrent plate boundaries

\overline {W}