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  Reverse glacier motion during iceberg calving and the cause of glacial earthquakes

Murray, T., Nettles, M., Selmes, N., Cathles, L. M., Burton, J. C., James, T. D., Edwards, S., Martin, I., O'Farrell, T., Aspey, R., Rutt, I., Bauge, T. (2015): Reverse glacier motion during iceberg calving and the cause of glacial earthquakes. - Science, 349, 305-308.
https://doi.org/10.1126/science.aab0460

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Murray, T.1, 2, Autor
Nettles, M.1, 2, Autor
Selmes, N.1, 2, Autor
Cathles, L. M.1, 2, Autor
Burton, J. C.1, 2, Autor
James, T. D.1, 2, Autor
Edwards, S.1, 2, Autor
Martin, I.1, 2, Autor
O'Farrell, T.1, 2, Autor
Aspey, R.1, 2, Autor
Rutt, I.1, 2, Autor
Bauge, T.1, 2, Autor
Affiliations:
1External Organizations, ou_persistent22              
2GEOFON, Deutsches GeoForschungsZentrum, Potsdam, , ou_2634888              

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 Zusammenfassung: Nearly half of Greenland’s mass loss occurs through iceberg calving, but the physical mechanisms operating during calving are poorly known and in situ observations are sparse. We show that calving at Greenland’s Helheim Glacier causes a minutes-long reversal of the glacier’s horizontal flow and a downward deflection of its terminus. The reverse motion results from the horizontal force caused by iceberg capsize and acceleration away from the glacier front. The downward motion results from a hydrodynamic pressure drop behind the capsizing berg, which also causes an upward force on the solid Earth. These forces are the source of glacial earthquakes, globally detectable seismic events whose proper interpretation will allow remote sensing of calving processes occurring at increasing numbers of outlet glaciers in Greenland and Antarctica.

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Sprache(n): eng - Englisch
 Datum: 2015
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1126/science.aab0460
 Art des Abschluß: -

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Titel: Science
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 349 Artikelnummer: - Start- / Endseite: 305 - 308 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals442