Seismicity of the Earth 1900-2012 Philippine Sea plate and vicinity

Smoczyk, Gregory M.; Hayes, Gavin P.; Hamburger, Michael W.; Benz, H.; Villaseñor, A.; Furlong, Kevin P.

doi:10.3133/ofr20101083m

Cited by 14 publications

(3 citation statements)

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“…Полученные разрезы при сопоставлении с актуаль ными материалами исследований соответствующих территорий [Smoczyk et al, 2013;Rhea et al, 2010aRhea et al, , 2010bHayes et al, 2012;Benz et al, 2011;Gorbatov et al, 1997] показали хорошую согласованность. Характерные для разных зон разрезы приведены на рис.…”

Section: Geodynamicsunclassified

Focal Mechanisms of Earthquakes in the Subduction Zone of the Western Pacific Plate

Bushenkova

Kuchay

2022

Geodin. tektonofiz.

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Deformation features of the subducting Pacific lithospheric plate are considered according to the data on earthquake focal mechanisms. The territory includes the convergent boundaries between the Pacific Plate and the North American (in the Aleutian arc region), the Okhotsk, the Eurasian and the Philippine plates.It has been shown that the angle of subducting Pacific Plate in the Aleutian subduction zone affects the focal mechanisms of earthquakes that occurred in the upper, 35 km part of the oceanic plate in the zone of its bending. There occur normal-fault earthquakes at a steep-angle subduction and rare thrust earthquakes at a shallow-angle subduction. The azimuthal orientation of P-axes of the focal mechanism solutions in the upper (1–70 km) contact zone corresponds to the Pacific Plate displacement vector when the plate fragments are subducting west-northwestwards. There occurs a change in azimuthal orientation of the compression axes in the subducting plate at a depth of more than 70 km: the axes occupy different azimuthal sectors showing difference in the orientation of their slope, with the orientations of the T-axes become multidirectional.The calculation of seismotectonic deformations was carried out based on the data on focal mechanisms of 7768 earthquakes. It was revealed that the Exx and Ezz deformation fields are the most homogeneous at depths of 1–70 km. The pattern of seismotectonic deformations changes abruptly for deep parts of the subducting plate (105–200, 200–400, and 400–700 km), there are observed heterogeneous deformation fields Exx, Eyy and Еzz with alternating episodes of extension and shortening.There has been proposed the author’s scheme of the influence of the upper mantle convection structure on the geometry of the subducting plate (slab) as a potential catalyst for the processes responsible for the separation of seismic activity zones and the change of earthquake types with depth and in different parts of the extended subduction zone.

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Section: Geodynamicsunclassified

Focal Mechanisms of Earthquakes in the Subduction Zone of the Western Pacific Plate

Bushenkova

Kuchay

2022

Geodin. tektonofiz.

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“…Smoczyk, G.M., Hayes, G.P., Hamburger, M.W., Benz, H.M., Villaseñor, Antonio, and Furlong, K.P., 2013, Seismicity of the Earth 1900-2012 Philippine Sea plate and vicinity: U.S. Geological Survey Open-File Report 2010-1083-M, scale 1:10,000,000, http://pubs.usgs.gov/of/2010/1083/m/.…”

Section: Philippine Sea Plate and Vicinitymentioning

confidence: 99%

Tectonic summaries of magnitude 7 and greater earthquakes from 2000 to 2015

Hayes¹,

Meyers²,

Dewey³

et al. 2017

Open-File Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://store.usgs.gov/.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Hayes, G.P., Myers, E.K., Dewey, J.W., Briggs, R.W., Earle, P.S., Benz, H.M., Smoczyk, G.M., Flamme, H.E., Barnhart, W.D., Gold, R.D., and Furlong, K.P., 2017, Tectonic summaries of magnitude 7 and greater earthquakes from 2000 to 2015: U.S. Geological Survey Open-File Report 2016-1192, 148 p., https://doi.org/10.3133/ofr20161192. ISSN 2331ISSN -1258 iii AcknowledgmentsThe knowledge and information expressed in these tectonic summaries is compiled by the authors and often utilizes a wealth of geological and geophysical literature, too numerous to list here. The authors thank all researchers who have worked to improve our understanding of global tectonics, historic earthquakes, and seismotectonic problems.All relative tectonic plate velocities were calculated using the UNAVCO Plate Motion Calculator and the MORVEL 2010 model (https://www.unavco.org/software/geodetic-utilities/platemotion-calculator/plate-motion-calculator.html). Contents AbstractThis paper describes the tectonic summaries for all magnitude 7 and larger earthquakes in the period 2000-2015, as produced by the U.S. Geological Survey National Earthquake Information Center during their routine response operations to global earthquakes. The goal of such summaries is to provide important event-specific information to the public rapidly and concisely, such that recent earthquakes can be understood within a global and regional seismotectonic framework. We compile these summaries here to provide a long-term archive for this information, and so that the variability in tectonic setting and earthquake history from region to region, and sometimes within a given region, can be more clearly understood.

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“…The Mariana Trench is an active accretionary boundary where the Pacific Plate is being subducted beneath the Philippine Plate at the rate of 1.0-4.6 cm yr −1 (Smoczyk et al, 2013). Consequently, the Mariana Trench and the Challenger Deep are very seismically active regions and produce moderate-sized earthquakes (m b ≥4) that are detected by global seismic networks every few days.…”

Section: Geophysical Sourcesmentioning

confidence: 99%

Ambient Sound at Challenger Deep, Mariana Trench

Dziak¹,

Haxel²,

Matsumoto³

et al. 2017

Oceanog.

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We present a record of ambient sound obtained using a unique deep-ocean instrument package and mooring that was successfully deployed in 2015 at Challenger Deep in the Mariana Trench. The 45 m long mooring contained a hydrophone and an RBR™ pressure-temperature sensor. The hydrophone recorded continuously for 24 days at a 32 kHz sample rate. The pressure logger recorded a maximum pressure of 11,161.4 decibars, corresponding to a depth of 10,829.7 m, where actual anchor depth was 10,854.7 m. Observed sound sources included earthquake acoustic signals (T phases), baleen and odontocete cetacean vocalizations, ship propeller sounds, airguns, active sonar, and the passing of a Category 4 typhoon. Overall, Challenger Deep sound levels in the ship traffic band (20-100 Hz) can be as high as noise levels caused by moderate shipping, which is likely due to persistent commercial and military ship traffic in the region. Challenger Deep sound levels due to sea surface wind/waves (500 Hz to 1 kHz band) are as high as sea state 2, but can also be very low, equivalent to sea state 0. To our knowledge, this is the first long-term (multiday to week) broadband sound record, and only the fifth in situ measurement of depth, ever made at Challenger Deep. Our study indicates that Challenger Deep, the ultimate hadal (>6,000 m) environment, can be relatively quiet but is not as acoustically isolated as previously thought, and weatherrelated surface processes can influence the soundscape in the deepest parts of the ocean.

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Seismicity of the Earth 1900-2012 Philippine Sea plate and vicinity

Cited by 14 publications

References 0 publications

Focal Mechanisms of Earthquakes in the Subduction Zone of the Western Pacific Plate

Focal Mechanisms of Earthquakes in the Subduction Zone of the Western Pacific Plate

Tectonic summaries of magnitude 7 and greater earthquakes from 2000 to 2015

Ambient Sound at Challenger Deep, Mariana Trench

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