Source‐Scaling Relations of Interface Subduction Earthquakes for Strong Ground Motion and Tsunami Simulation

2016 ◽  
Vol 106 (4) ◽  
pp. 1652-1662 ◽  
Author(s):  
A. A. Skarlatoudis ◽  
P. G. Somerville ◽  
H. K. Thio
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Scaling Relations ◽  
Tsunami Simulation ◽  
Subduction Earthquakes ◽  
Source Scaling ◽  
Strong Ground

Broadband Strong Ground Motion Simulations of Large Subduction Earthquakes

2015 ◽  
Vol 105 (6) ◽  
pp. 3050-3067 ◽  
Author(s):  
A. A. Skarlatoudis ◽  
P. G. Somerville ◽  
H. K. Thio ◽  
J. R. Bayless
Keyword(s):  
Ground Motion ◽  
Strong Ground Motion ◽  
Subduction Earthquakes ◽  
Ground Motion Simulations ◽  
Strong Ground

Proposed methodology for estimating the magnitude at which subduction megathrust ground motions and source dimensions exhibit a break in magnitude scaling: Example for 79 global subduction zones

2020 ◽  
Vol 36 (3) ◽  
pp. 1271-1297
Author(s):  
Kenneth W. Campbell
Keyword(s):  
Ground Motion ◽  
Subduction Zones ◽  
Ground Motions ◽  
Seismic Source ◽  
Scaling Relations ◽  
Megathrust Earthquakes ◽  
Source Dimensions ◽  
Magnitude Scaling ◽  
Aspect Ratios ◽  
Source Scaling

In this article, I propose a method for estimating the magnitude [Formula: see text] at which subduction megathrust earthquakes are expected to exhibit a break in magnitude scaling of both seismic source dimensions and earthquake ground motions. The methodology is demonstrated by applying it to 79 global subduction zones defined in the literature, including Cascadia. Breakpoint magnitude is estimated from seismogenic interface widths, empirical source scaling relations, and aspect ratios of physically unbounded earthquake ruptures and their uncertainties. The concept stems from the well-established observation that source-dimension and ground motion scaling decreases for shallow continental (primarily strike-slip) earthquakes when rupture exceeds the seismogenic width of the fault. Although a scaling break for megathrust earthquakes is difficult to observe empirically, all of the instrumentally recorded historical [Formula: see text] mega-earthquakes have occurred on subduction zones with [Formula: see text] (8.1–8.9), consistent with an observed break in source scaling relations derived from these same events. The breakpoint magnitudes derived in this study can be used to constrain the magnitude at which the scaling of ground motion is expected to decrease in subduction ground motion prediction equations.

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