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Did the 1999 earthquake swarm on Gakkel Ridge open a volcanic conduit? A detailed teleseismic data analysis

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Abstract

In 1999, a seismic swarm of 237 teleseismically recorded events marked a submarine eruption along the Arctic Gakkel Ridge, later on also analyzed by sonar, bathymetric, hydrothermal, and local seismic studies. We relocated the swarm with the global location algorithm HYPOSAT and analyzed the waveforms of the stations closest to the events by cross-correlation. We find event locations scattered around 85°35′ N and 85° E at the southern rift wall and inside the rift valley of the Gakkel Ridge. Waveforms of three highly correlating events indicate a volumetric moment tensor component and highly precise referenced double-difference arrival times lead us to believe that they occur at the same geographical position and mark the conduit located further southeast close to a chain of recently imaged volcanic cones. This result is supported by station residual anomalies in the direction of the potential conduit. Seismicity is focused at the crust–mantle boundary at 16–20 km depth, but ascending toward the potential conduit during the beginning of April 1999, indicating an opening of the vent.

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  1. Carsten Riedel

    Present address: KGS Rastede, WIlhelmstr. 5, 26180, Rastede, Germany

Authors and Affiliations

  1. Alfred-Wegener-Institut für Polar- und Meeresforschung, Am alten Hafen 26, 27568, Bremerhaven, Germany

    Carsten Riedel & Vera Schlindwein

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  1. Carsten Riedel
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  2. Vera Schlindwein
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Correspondence to Carsten Riedel.

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Riedel, C., Schlindwein, V. Did the 1999 earthquake swarm on Gakkel Ridge open a volcanic conduit? A detailed teleseismic data analysis. J Seismol 14, 505–522 (2010). https://doi.org/10.1007/s10950-009-9179-6

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  • DOI: https://doi.org/10.1007/s10950-009-9179-6

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