Bassett Dan

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Bassett
First Name
Dan
ORCID
0000-0001-6351-0284

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  • Preprint
    Rupture evolution of the 2006 Java tsunami earthquake and the possible role of splay faults
    ( 2017-09-25) Fan, Wenyuan ; Bassett, Dan ; Jiang, Junie ; Shearer, Peter M. ; Ji, Chen
    The 2006 Mw 7.8 Java earthquake was a tsunami earthquake, exhibiting frequency-dependent seismic radiation along strike. High-frequency global back-projection results suggest two distinct rupture stages. The first stage lasted ~65 s with a rupture speed of ~1.2 km/s, while the second stage lasted from ~65 to 150 s with a rupture speed of ~2.7 km/s. High-frequency radiators resolved with back-projection during the second stage spatially correlate with splay fault traces mapped from residual free-air gravity anomalies. These splay faults also colocate with a major tsunami source associated with the earthquake inferred from tsunami first-crest back-propagation simulation. These correlations suggest that the splay faults may have been reactivated during the Java earthquake, as has been proposed for other tsunamigenic earthquakes, such as the 1944 Mw 8.1 Tonankai earthquake in the Nankai Trough.
  • Article
    Episodic intraplate magmatism fed by a long-lived melt channel of distal plume origin
    (American Association for the Advancement of Science, 2023-06-09) Naif, Samer ; Miller, Nathaniel C. ; Shillington, Donna J. ; Becel, Anne ; Lizarralde, Daniel ; Bassett, Dan ; Hemming, Sidney R.
    In the past decade, marine geophysical observations have led to the discovery of thin channels at the base of oceanic plates with anomalous physical properties that indicate the presence of low-degree partial melts. However, mantle melts are buoyant and should migrate toward the surface. We show abundant observations of widespread intraplate magmatism on the Cocos Plate where a thin partial melt channel was imaged at the lithosphere-asthenosphere boundary. We combine existing geophysical, geochemical, and seafloor drilling results with seismic reflection data and radiometric dating of drill cores to constrain the origin, distribution, and timing of this magmatism. Our synthesis indicates that the sublithospheric channel is a regionally extensive (>100,000 km2) and long-lived feature that originated from the Galápagos Plume more than 20 Ma ago, supplying melt for multiple magmatic events and persisting today. Plume-fed melt channels may be widespread and long-lived sources for intraplate magmatism and mantle metasomatism.