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040 |aCaOODSP|beng|erda|cCaOODSP
0861 |aM183-2/8925E-PDF
1001 |aPlourde, A. P. |q(Alexandre P.)|eauthor.
24510|aMapping tectonic stress at subduction zones with earthquake focal mechanisms : |bapplication to Cascadia, Japan, Nankai, Mexico, and northern Chile / |cA.P. Plourde and J.F. Cassidy.
264 1|a[Ottawa] : |bGeological Survey of Canada, |c2022.
264 4|c©2022
300 |a1 online resource (35 pages) : |bcolour illustrations.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aOpen file, |x2816-7155 ; |v8925
504 |aIncludes bibliographical references (pages 32-35).
5203 |a"Earthquake focal mechanisms have contributed substantially to our understanding of modern tectonic stress regimes, perhaps more than any other data source. Studies generally group focal mechanisms by epicentral location to examine variations in stress across a region. However, stress variations with depth have rarely been considered, either due to data limitations or because they were believed to be negligible. This study presents 3D grids of tectonic stress tensors using existing focal mechanism catalogs from several subduction zones, including Cascadia, Japan, Nankai, Mexico, and northern Chile. We bin data into 50 x 50 x 10 km cells (north, east, vertical), with 50% overlap in all three directions. This resulted in 181380 stress inversions, with 90% of these in Japan (including Nankai). To the best of our knowledge, this is the first examination of stress changes with depth in several of these regions. The resulting maps and cross-sections of stress can help distinguish locked and creeping segments of the plate interface. Similarly, by dividing the focal mechanism catalog in northern Japan into those before and those >6 months after the 2011 Mw 9.1 Tohoku-Oki earthquake, we are able to produce detailed 3D maps of stress rotation, which is close to 90° near the areas of highest slip. These results could inform geodynamic rupture models of future megathrust earthquakes in order to more accurately estimate slip, shaking, and seismic hazard"--Abstract, page 4.
650 0|aEarthquakes.
650 0|aSeismology.
650 0|aSubduction zones.
650 0|aThree-dimensional imaging in geology.
650 6|aTremblements de terre.
650 6|aSismologie.
650 6|aZones de subduction.
650 6|aImagerie tridimensionnelle en géologie.
7102 |aGeological Survey of Canada, |eissuing body.
830#0|aOpen file (Geological Survey of Canada)|v8925.|w(CaOODSP)9.506878
85640|qPDF|s4.34 MB|uhttps://publications.gc.ca/collections/collection_2023/rncan-nrcan/m183-2/M183-2-8925-eng.pdf|z(report)
8564 |qHTML|sN/A|uhttps://doi.org/10.4095/330943|z(complete dataset)