Lithospheric shear velocity structure of South Island, New Zealand, from amphibious Rayleigh wave tomography

dc.contributor.author Ball, Justin S.
dc.contributor.author Sheehan, Anne F.
dc.contributor.author Stachnik, Joshua C.
dc.contributor.author Lin, Fan-Chi
dc.contributor.author Yeck, William
dc.contributor.author Collins, John A.
dc.date.accessioned 2016-09-22T15:06:10Z
dc.date.available 2016-11-23T09:34:18Z
dc.date.issued 2016-05-23
dc.description Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 121 (2016): 3686–3702, doi:10.1002/2015JB012726. en_US
dc.description.abstract We present a crust and mantle 3-D shear velocity model extending well offshore of New Zealand's South Island, imaging the lithosphere beneath the South Island as well as the Campbell and Challenger Plateaus. Our model is constructed via linearized inversion of both teleseismic (18–70 s period) and ambient noise-based (8–25 s period) Rayleigh wave dispersion measurements. We augment an array of 4 land-based and 29 ocean bottom instruments deployed off the South Island's east and west coasts in 2009–2010 by the Marine Observations of Anisotropy Near Aotearoa experiment with 28 land-based seismometers from New Zealand's permanent GeoNet array. Major features of our shear wave velocity (Vs) model include a low-velocity (Vs < 4.4 km/s) body extending from near surface to greater than 75 km depth beneath the Banks and Otago Peninsulas and high-velocity (Vs~4.7 km/s) mantle anomalies underlying the Southern Alps and off the northwest coast of the South Island. Using the 4.5 km/s contour as a proxy for the lithosphere-asthenosphere boundary, our model suggests that the lithospheric thickness of Challenger Plateau and central South Island is substantially greater than that of the inner Campbell Plateau. The high-velocity anomaly we resolve at subcrustal depths (>50 km) beneath the central South Island exhibits strong spatial correlation with upper mantle earthquake hypocenters beneath the Alpine Fault. The ~400 km long low-velocity zone we image beneath eastern South Island and the inner Bounty Trough underlies Cenozoic volcanics and the locations of mantle-derived helium measurements, consistent with asthenospheric upwelling in the region. en_US
dc.description.embargo 2016-11-23 en_US
dc.description.sponsorship National Science Foundation Grant Number: EAR-0409564, EAR-0409609, and EAR-0409835 en_US
dc.identifier.citation Journal of Geophysical Research: Solid Earth 121 (2016): 3686–3702 en_US
dc.identifier.doi 10.1002/2015JB012726
dc.identifier.uri https://hdl.handle.net/1912/8404
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons en_US
dc.relation.uri https://doi.org/10.1002/2015JB012726
dc.subject OBS Rayleigh wave tomography en_US
dc.subject South Island, New Zealand en_US
dc.subject Challenger Plateau en_US
dc.subject MOANA experiment en_US
dc.subject Convergent tectonics en_US
dc.subject Mantle lithosphere en_US
dc.title Lithospheric shear velocity structure of South Island, New Zealand, from amphibious Rayleigh wave tomography en_US
dc.type Article en_US
dspace.entity.type Publication
relation.isAuthorOfPublication 5d56d9cc-f760-4397-bb21-1b809f8c155e
relation.isAuthorOfPublication 3179e2e8-8d46-469a-8642-448ddff4d7ee
relation.isAuthorOfPublication 72d76780-4284-4494-b455-e92b1485a5dc
relation.isAuthorOfPublication 8f1fcdaf-e74d-4760-ad0f-8dbc99f334ff
relation.isAuthorOfPublication 91adcc57-3fb1-468a-aec8-b9ce0323e710
relation.isAuthorOfPublication abcef1b9-2def-44e4-9a23-e2dcb5c89d4a
relation.isAuthorOfPublication.latestForDiscovery 5d56d9cc-f760-4397-bb21-1b809f8c155e
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Ball_et_al-2016-Journal_of_Geophysical_Research__Solid_Earth.pdf
Size:
9 MB
Format:
Adobe Portable Document Format
Description:
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.89 KB
Format:
Item-specific license agreed upon to submission
Description: