The 17 July 2006 Java Tsunami Earthquake (Mw = 7.8)

The 17 July 2006 Java Tsunami Earthquake (Mw = 7.8) Map showing the Global CMT solutions for the 17 July 2006 Java tsunami earthquake and regional aftershocks and NEIC epicenters of mainshock (star), aftershocks (dark circles), and prior activity (gray circles).
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The 17 July 2006 Java earthquake involved thrust faulting in the Java trench and excited a deadly tsunami (~ 5-8 m) that inundated the southern coast of Java. The earthquake’s size estimates vary significantly with seismic wave period: very long-period signals (300-500+ s) indicate a seismic moment of 6.7 x 10**20 Nm (Mw = 7.8), Ms (~20 s) = 7.2, mb (~1 s) = 6.2, while shaking intensities (3-10 Hz) were ≤ MMIV. The large tsunami relative to Ms characterizes this event as a tsunami earthquake. Like previous tsunami earthquakes, the Java event had an unusually low rupture speed of 1.0-1.5 km/s, and occurred near the up-dip edge of the subduction zone thrust fault. Most large aftershocks involved normal faulting. The rupture propagated ~200 km along the trench, with several pulses of shorter period seismic radiation superimposed on a smooth background rupture with an overall duration of ~185 s. The rupture process was analyzed using finite fault inversion of P, SH, and Rayleigh wave source time functions, with the excellent quality of the data providing good resolution of the rupture velocity (Ammon et al., 2006). This is the best recorded tsunami earthquake since the 1992 Nicaragua rupture, and the great expansion of broadband data since that time enables much more robust characterization of the anomalous source process.
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References
</p><p>Ammon, C. J., H. Kanamori, T. Lay, and A. A. Velasco (2006), The 17 July 2006 Java tsunami earthquake, Geophys. Res. Lett., 233, L234308, doi:10.10239/2006GL028005.
</p><p>Acknowledgements: The facilities of the IRIS Data Management System were used to access the data used in this study.</p>

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