Transition zone structure under a stationary hot spot: Cape Verde |
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| Authors: | George Helffrich Bruno Faria João FBD Fonseca Alexandra Lodge Satoshi Kaneshima |
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| Institution: | 1. Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio Emilia, c/o DIEF (ex DIMA), Via Vignolese 905a, I-41125 Modena, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata 605, Roma, Italy;1. Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, 44100 Ferrara, Italy;2. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Bologna, Piazza di Porta S. Donato 1, 40126 Bologna, Italy;3. CNR-IGG (Consiglio Nazionale delle Ricerche—Istituto di Geoscienze e Georisorse), U.O.S. Pavia, Via Ferrata 1, 27100 Pavia, Italy;4. Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, 20133 Milano, Italy |
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| Abstract: | We report on a two-year seismic deployment in the Cape Verde Islands, one goal of which was to study the upper mantle to determine its structure under a hot spot that is stationary in the hot spot reference frame. We find from analysis of P-to-S receiver functions estimated from broadband seismic recordings that, within uncertainty, the time separation between the 410 and 660 km discontinuities is normal compared to radial earth models. Thus, to exist, even stationary hot spots do not require vertical thermal anomalies from deep melting sources anchored in the lower mantle or at the core–mantle boundary or their anomalies are narrower than ～ 250 km in the upper mantle. |
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