Crustal and uppermost mantle structure of southern Norway: results from surface wave analysis of ambient seismic noise and earthquake data

Author： Köhler Andreas   Weidle Christian   Maupin Valérie  

Publisher： Oxford University Press

ISSN： 0956-540X

Source： Geophysical Journal International, Vol.191, Iss.3, 2012-12, pp. : 1441-1456

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

SUMMARYWe use ambient seismic noise and earthquake recordings on a temporary regional network in southern Norway to produce Rayleigh and Love wave phase velocity maps from 3 to 67 s period. Local dispersion curves are then jointly inverted for a 3-D shear wave velocity model of the region. We perform a two-step inversion approach. First, a direct search, Monte Carlo algorithm is applied to find best fitting isotropic velocity depth profiles. Those profiles are then used as initial models for a linearised inversion which takes into account radial anisotropy in the shear wave structure. Results reveal crustal as well as uppermost mantle structures in the studied region. Velocity anomalies in the upper crust are rather small in amplitude and can in most parts be related to surface geology in terms of rock densities. Old tectonic units like the Oslo Graben (300–240 Ma) and the Caledonian nappes (440–410 Ma) are clearly imaged. Furthermore, we find clear indications for localized crustal anisotropy of about 3 per cent. Despite generally poor resolution of interface depths in surface wave inversion, we find lateral variation of crustal thickness in agreement with previous studies. We are able to confirm and locate the transition from a slow lithospheric upper mantle underneath southern Norway to a fast shield-like mantle towards Sweden.

Related content

Crustal and uppermost mantle S -wave velocity structure beneath the Japanese islands from seismic ambient noise tomography

By Guo Zhi  

Geophysical Journal International, Vol. 193, Iss. 1, 2013-04 ,pp. : 394-406 (13)

Oxford University Press

Access to resources Recommend Favorite

Crustal and uppermost mantle velocity structure beneath northwestern China from seismic ambient noise tomography

By Li Hongyi   Li S.   Song X. D.   Gong M.   Li X.   Jia J.  

Geophysical Journal International, Vol. 188, Iss. 1, 2012-01 ,pp. : 131-143 (13)

Oxford University Press

Access to resources Recommend Favorite

Crustal and uppermost mantle velocity structure along a profile across the Pamir and southern Tien Shan as derived from project TIPAGE wide-angle seismic data

By Mechie J.   Yuan X.   Schurr B.   Schneider F.   Sippl C.   Ratschbacher L.   Minaev V.   Gadoev M.   Oimahmadov I.   Abdybachaev U.   Moldobekov B.   Orunbaev S.   Negmatullaev S.  

Geophysical Journal International, Vol. 188, Iss. 2, 2012-02 ,pp. : 385-407 (23)

Oxford University Press

Access to resources Recommend Favorite

Directionality analysis and Rayleigh wave tomography of ambient seismic noise in southern Norway

By Köhler Andreas   Weidle Christian   Maupin Valérie  

Geophysical Journal International, Vol. 184, Iss. 1, 2011-01 ,pp. : 287-300 (14)

Oxford University Press

Access to resources Recommend Favorite

The structure of the crust and uppermost mantle beneath South China from ambient noise and earthquake tomography

By Zhou Longquan   Xie Jiayi   Shen Weisen   Zheng Yong   Yang Yingjie   Shi Haixia   Ritzwoller Michael H.  

Geophysical Journal International, Vol. 189, Iss. 3, 2012-06 ,pp. : 1565-1583 (19)

Oxford University Press

Access to resources Recommend Favorite