Crustal thickness beneath the Ryukyu arc from travel-time inversion View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2009-10

AUTHORS

Mamoru Nakamura, Nozomi Umedu

ABSTRACT

First P-wave arrival times recorded by the seismic network in the Ryukyu arc were analyzed in order to image the lateral variation in crustal thickness beneath the Ryukyu arc. The results indicate a low Pn velocity (7.5 km/s) in the Ryukyu arc and a relatively high Pn velocity (7.9 km/s) in the Okinawa Trough. The crustal thickness changes between the northern-and-central Ryukyu arc (range 23–27 km) and the southern Ryukyu arc (range 29–44 km). The crustal thickness of the former is consistent with that in the northern-and-central Okinawa Trough, suggesting a flat Moho stretching from the Okinawa Trough to the Ryukyu arc. This flat Moho extends uniformly over a wide area. In contrast, the crustal thickness in the southern Ryukyu arc is consistent with the characteristics of the crustal structure whereby the Moho becomes shallower in the vicinity of the axis of the Okinawa Trough and deepens remarkably with increasing distance from the axis in the southern Ryukyu arc. These differences would be caused by the difference in rifting style between the northern-and-central Okinawa Trough and the southern Okinawa Trough. More... »

PAGES

1191-1195

References to SciGraph publications

Journal

TITLE

Earth, Planets and Space

ISSUE

10

VOLUME

61

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/bf03352971

DOI

http://dx.doi.org/10.1186/bf03352971

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040674241


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