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http://dx.doi.org/10.7582/GGE.2014.17.2.066

Shear Wave Velocity Structure Beneath White Island Volcano, New Zealand, from Receiver Function Inversion and H-κ Stacking Methods  

Park, Iseul (Department of Geophysics, Kangwon National University)
Kim, Ki Young (Department of Geophysics, Kangwon National University)
Publication Information
Geophysics and Geophysical Exploration / v.17, no.2, 2014 , pp. 66-73 More about this Journal
Abstract
To estimate the shear-velocity ($v_s$) structure beneath the WIZ station on White Island in New Zealand, we applied receiver function (RF) inversion and H-${\kappa}$ stacking methods to 362 teleseismic events (Mw > 5.5) recorded during April 20, 2007 to September 6, 2013. Using 71 RFs with errors less than 20% after 200 iterative computations, we determined that the depth to Moho of $v_s$ = 4.35 km/s is $24{\pm}1km$ within a 15 km radius of the station. In an 1-d $v_s$ model derived by RF inversions, a 4-km thick low-velocity layer (LVL) at depths of 18 ~ 22 km was identified in the lower crust. This LVL, which is 0.15 km/s slower than the rocks above and below it, may indicate the presence of a deep magma reservoir. The H-${\kappa}$ stacking method yielded an estimate of the depth to the Moho of 24.5 km, which agrees well with the depth determined by RF inversions. The low $v_p/v_s$ ratio of 1.64 may be due to the presence of gas-filled rock or hot crystallizing magma.
Keywords
White Island; receiver function; H-${\kappa}$ stack; low velocity layer; Moho; $v_p/v_s$;
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