Landslides and ground damage during the Mw5.8 Matukituki Earthquake, 4 May 2015, central Otago, New Zealand

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Cox, S.C.; Barrell, D.J.A.; Dellow, G.D.; McColl, S.T.; Horspool, N.A. 2015 Landslides and ground damage during the Mw5.8 Matukituki Earthquake, 4 May 2015, central Otago, New Zealand. Lower Hutt, N.Z.: GNS Science. GNS Science report 2015/17 12 p.

Abstract: A helicopter reconnaissance was undertaken to assess ground damage and landsliding associated with M5.8 Matukituki Earthquake of 4 May 2015, which occurred 30 km northwest of Wanaka, at a depth of about 5 km. Thirty-seven earthquake-induced failures were recorded within an 800 km2 area, principally small rockfalls of 1-1000 m3 volume from pre-existing landslide scars, but including some newly generated bedrock failures. The total volume of rockfall is unlikely to have exceeded 30,000 m3. Observations are consistent with empirical predictions based on earthquake-induced landsliding elsewhere in New Zealand. The observations from the Matukituki Earthquake help to delineate the lower magnitude threshold for earthquake-induced landsliding. (auth)