The P wavespeed structure in the mantle to 800 km depth below the Philippines region: geodynamic implications

Wright, C.

doi:10.1016/j.tecto.2007.11.001

Cited by 2 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A thinned transition zone was shown in the Kurile-Kamchatka subduction zone by Petersen et al (1993a) and in southern California by Gurrola and Bernard Minster (1998). Relatively strong local variations of the transition zone thickness have been observed in Central Asia by Neves et al (1996) in nuclear explosion data, in Indonesia by Saita et al (2002), below the Philippines by Wright (2009) with wide-angle data, below the Philippine Sea by Suetsugu et al (2010), and at the Mariana slab by Tibi et al (2006) with ocean-bottom seismometers.…”

Section: Other Regionsmentioning

confidence: 97%

Deep Earth Structure - Transition Zone and Mantle Discontinuities

Kind

2015

Treatise on Geophysics

View full text Add to dashboard Cite

Section: Other Regionsmentioning

confidence: 97%

Deep Earth Structure - Transition Zone and Mantle Discontinuities

Kind

2015

Treatise on Geophysics

View full text Add to dashboard Cite

“…A one-dimensional (1D) initial model ( Figure 4) was derived from the models CRUST2.0 (Bassin et al 2000), IASP91 (Kennett and Engdahl 1991), and WPSP01P (Wright and Kuo 2007;Wright 2009). Inversion for both oceanic and continental crustal structure resulted in dramatic undulations in Moho depth, and therefore the crustal thickness and velocities from the CRUST2.0 model were introduced into the starting velocity model, which significantly reduced the travel-time residuals.…”

Section: Model Parameterization and Inversionmentioning

confidence: 99%

“…Initial P-wave velocity model used in the study (red line), IASP91 (blue line)(Kennett and Engdahl 1991), and WPSP01P model (green line)(Wright and Kuo 2007;Wright 2009). …”

mentioning

confidence: 99%

Tomographic evidence for a slab tear induced by fossil ridge subduction at Manila Trench, South China Sea

Fan

Spence

2014

International Geology Review

View full text Add to dashboard Cite

A tomographic travel-time inversion has been applied to trace the subducted slab of the South China Sea (SCS) beneath the Manila Trench. The dataset, taken from the International Seismological Centre , is composed of 13,087 P-wave arrival times from 1401 regional earthquakes and 8834 from 1350 teleseismic events. The results image the different morphology of the subducted SCS slab as a high-velocity zone. The subducting angle of the slab varies along the trench: at 16°N and 16.5°N, the slab dips at a low angle (24°~32°) for 20-250 km depth and at a moderate angle (50°) for~250-400 km depth. At 17°N, the slab dips at a low angle (32°) to near 400 km depth, and at 17.5°N and 18°N the slabs are near vertical from 70~700 km depth, while at 20°N the high-velocity anomalies exhibit features from horizontal abruptly to near vertical, extending to 500 km depth. The dramatic steepening of the slab between 17°N and 17.5°N may indicate a slab tear, which is coincident with the axis of a fossil ridge within the SCS slab at around 17°N. In addition, low-velocity zones in the three profiles above 300 km depth may represent the formation of the slab window, induced by ridge subduction and slab tear, initiating upward mantle flow and resulting in the partial melting of the edge of the slab. The slab tear could explain the volcanic gap and geochemical difference between the extinct Miocene and Quaternary volcanoes in the Luzon Arc, the much higher heat flow around the fossil ridge, and the distribution of most of the adakites and the related porphyry Cu-Au deposits in the Luzon area. Based on the geometry and morphology of the subducted slab and certain assumptions, we calculate the initial time of ridge subduction, which implies that ridge subduction and slab tear possibly started at~8 Ma.

show abstract

The P wavespeed structure in the mantle to 800 km depth below the Philippines region: geodynamic implications

Cited by 2 publications

References 26 publications

Deep Earth Structure - Transition Zone and Mantle Discontinuities

Deep Earth Structure - Transition Zone and Mantle Discontinuities

Tomographic evidence for a slab tear induced by fossil ridge subduction at Manila Trench, South China Sea

Contact Info

Product

Resources

About