These results suggest that asperities responsible for earthquake release at the Mw > 6 levels vary in size along strike but not much in downdip width. (2002) used nearby hydroacoustic stations to locate very small events and aftershocks along a number of oceanic transform faults. Their surface wave magnitudes, Ms, are plotted. A Seabeam reconnaissance of the 400 km-long fast-slipping (88 mm yr-1) Heezen transform fault zone and the 55 km-long spreading center that links it to Tharp transform defined and bathymetrically described several types of ridges built by tectonic uplift and volcanic construction. trench to the Eltanin Fracture Zone. Forsyth The remaining five segments were the sites of fewer large shocks of Mw 6.0-6.39. Although 4. These species await a formal description and it is not known whether or not they represent communities distinct from those on the northern MAR. ISC located an earthquake along that segment of Ms 6.1 on 1967 September 9. Fielding Enter the email address you signed up with and we'll email you a reset link. S. Carbotte (written communication, 2011 July 22) notes, however, that some of the shocks along the eastern end of the Tharp transform might fall within a zone of deformed/rotated seafloor south of the transform that looks quite similar to the zone of deformation north of the Heezen transform described by Lonsdale (1994) and seen in Fig. The excitation of the long-period waveforms used in the CMT analysis does not vary rapidly as a function of source depth for shallow-focus earthquakes. Undersea Features Fishing & Outdoor Fracture Zone Maps: Undersea Features is home to a total of 187 Fracture Zone(s), listed below. fault zone where the two blocks/plates on either side move side by Our distributions of earthquakes do not fit other thermal models that we have examined. Weissel (2005). . COV = 0 and 1.0 correspond to strict periodicity and random occurrence, respectively. DeMets The centroid epicentre and time did not shift appreciably in these different inversions, nor did the geometry of the moment tensor change appreciably. Sykes & Menke (2006) calculated maximum-likelihood estimates of COV that were 0.3 or smaller for a number of large-to-great earthquakes that ruptured nearly the same segments of strike-slip and subduction zone faults.
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