Slab tears and intermediate‐depth seismicity
MetadataShow full item record
Active tectonic regions where plate boundaries transition from subduction to strike slip can take several forms, such as triple junctions, acute, and obtuse corners. Well‐documented slab tears that are associated with high rates of intermediate‐depth seismicity are considered here: Gibraltar arc, the southern and northern ends of the Lesser Antilles arc, and the northern end of Tonga trench. Seismicity at each of these locations occurs, at times, in the form of swarms or clusters, and various authors have proposed that each marks an active locus of tear propagation. The swarms and clusters start at the top of the slab below the asthenospheric wedge and extend 30–60 km vertically downward within the slab. We propose that these swarms and clusters are generated by fluid‐related embrittlement of mantle rocks. Focal mechanisms of these swarms generally fit the shear motion that is thought to be associated with the tearing process.
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 40 (2013): 4244-4248, doi:10.1002/grl.50830.
Suggested CitationArticle: Meighan, Hallie E., ten Brink, Uri S., Pulliam, Jay, "Slab tears and intermediate‐depth seismicity", Geophysical Research Letters 40 (2013): 4244-4248, DOI:10.1002/grl.50830, https://hdl.handle.net/1912/10718
Showing items related by title, author, creator and subject.
Upper crustal structure and axial topography at intermediate spreading ridges : seismic constraints from the southern Juan de Fuca Ridge Canales, J. Pablo; Detrick, Robert S.; Carbotte, Suzanne M.; Kent, Graham M.; Diebold, John B.; Harding, Alistair J.; Babcock, Jeffrey M.; Nedimovic, Mladen R.; Van Ark, Emily M. (American Geophysical Union, 2005-12-14)We use multichannel seismic reflection data to image the upper crustal structure of 0-620 ka crust along the southern Juan de Fuca Ridge (JdFR). The study area comprises two segments spreading at intermediate rate with ...
Decreased influence of Antarctic intermediate water in the tropical Atlantic during North Atlantic cold events Huang, Kuo-Fang; Oppo, Delia W.; Curry, William B. (Elsevier, 2014-01-15)Antarctic Intermediate Water (AAIW) is a key player in the global ocean circulation, contributing to the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), and influencing interhemispheric heat exchange ...
Tolwinski-Ward, S. E.; Anchukaitis, Kevin J.; Evans, Michael N. (Copernicus Publications on behalf of the European Geosciences Union, 2013-07-15)We present a Bayesian model for estimating the parameters of the VS-Lite forward model of tree-ring width for a particular chronology and its local climatology. The scheme also provides information about the uncertainty ...