Skip to Main content Skip to Navigation
Journal articles

The effect of slip variability on earthquake slip-length scaling

Abstract : There has been debate on whether average slip D in long ruptures should scale with rupture length L, or with rupture width W. This scaling discussion is equivalent to asking whether average stress drop σ , which is sometimes considered an intrinsic frictional property of a fault, is approximately constant over a wide range of earthquake sizes. In this paper, we examine slip-length scaling relations using a simplified 1-D model of spatially heterogeneous slip. The spatially heterogeneous slip is characterized by a stochastic function with a Fourier spectrum that decays as k −α , where k is the wavenumber and α is a parameter that describes the spatial smoothness of slip. We adopt the simple rule that an individual earthquake rupture consists of only one spatially continuous segment of slip (i.e. earthquakes are not generally separable into multiple disconnected segments of slip). In this model, the slip-length scaling relation is intimately related to the spatial heterogeneity of the slip; linear scaling of average slip with rupture length only occurs when α is about 1.5, which is a relatively smooth spatial distribution of slip. We investigate suites of simulated ruptures with different smoothness, and we show that faults with large slip heterogeneity tend to have higher D/L ratios than those with spatially smooth slip. The model also predicts that rougher faults tend to generate larger numbers of small earthquakes, whereas smooth faults may have a uniform size distribution of earthquakes. This simple 1-D fault model suggests that some aspects of stress drop scaling are a consequence of whatever is responsible for the spatial heterogeneity of slip in earthquakes.
Document type :
Journal articles
Complete list of metadatas

Cited literature [63 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01301729
Contributor : Eva Fareau <>
Submitted on : Tuesday, April 12, 2016 - 5:17:01 PM
Last modification on : Friday, March 27, 2020 - 2:09:02 AM
Long-term archiving on: : Wednesday, July 13, 2016 - 12:40:52 PM

File

Geophys. J. Int.-2005-Liu-Zeng...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Jing Liu-Zeng, Thomas Heaton, Christopher Dicaprio. The effect of slip variability on earthquake slip-length scaling. Geophysical Journal International, Oxford University Press (OUP), 2005, 162 (3), pp.841-849. ⟨10.1111/j.1365-246X.2005.02679.x⟩. ⟨insu-01301729⟩

Share

Metrics

Record views

340

Files downloads

808