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Earthquake slip on oceanic transform faults

Nature volume 410, pages 74–77 (2001)Cite this article

Abstract

Oceanic transform faults are one of the main types of plate boundary, but the manner in which they slip remains poorly understood. Early studies suggested that relatively slow earthquake rupture might be common1,2; moreover, it has been reported that very slow slip precedes some oceanic transform earthquakes, including the 1994 Romanche earthquake3,4,5. The presence of such detectable precursors would have obvious implications for earthquake prediction. Here we model broadband seismograms of body waves to obtain well-resolved depths and rupture mechanisms for 14 earthquakes on the Romanche and Chain transform faults in the equatorial Atlantic Ocean. We found that earthquakes on the longer Romanche transform are systematically deeper than those on the neighbouring Chain transform. These depths indicate that the maximum depth of brittle failure is at a temperature of ∼600 °C in oceanic lithosphere. We find that the body waves from the Romanche 1994 earthquake can be well modelled with relatively deep slip on a single fault, and we use the mechanism and depth of this earthquake to recalculate its source spectrum. The previously reported slow precursor can be explained as an artefact of uncertainties in the assumed model parameters.

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Figure 1: Map of the equatorial Mid-Atlantic Ridge, showing the Romanche and Chain transform faults and also the bathymetry26,27.
Figure 2: Comparison of the waveforms from six earthquakes, three on each of the Romanche and Chain transforms.
Figure 3: Inversion for slip distribution in the 14 March 1994 Romanche earthquake (Mw 7.1).
Figure 4: Long-period source spectra of the 1994 Romanche transform earthquake (Mw 7.0).
Figure 5: Depth and temperature of earthquakes on the Romanche and Chain transforms.

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Acknowledgements

We thank M. Antolik for assistance with the slip inversion, and J. Tromp for discussion.

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  1. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, 02138, Massachusetts, USA

    Rachel E. Abercrombie & Göran Ekström

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  1. Rachel E. Abercrombie
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  2. Göran Ekström
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Correspondence to Rachel E. Abercrombie.

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Abercrombie, R., Ekström, G. Earthquake slip on oceanic transform faults. Nature 410, 74–77 (2001). https://doi.org/10.1038/35065064

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