28 November 2016
A revised landslide map for the M=7.8 Kaikoura earthquake
Valkaniotis Sotiris of the Earthquake Geology Research Group and the Aristotle University of Thessaloniki has posted a revised map of the landslides triggered by the M=7.8 Kaikoura Earthquake in New Zealand on his blog. This map is available as a high resolution download:
To generate this map, which shows 5,875 landslides is a remarkable effort. The maps of the density of landslides is particularly interesting to me:
I noted in my earlier post that a reasonable first order estimate of the landslide locations can be obtained from the coincidence of the topography and the aftershock sequence. This is a map of the aftershocks from the earthquake, mapped as a KML by Geonet.
The coincidence between the two is not perfect of course (we would not expect it to be) but the aftershocks are a surprisingly good predictor of the landslide distribution. It would be interesting to know whether the aftershocks are a better predictor than the ShakeMap peak ground acceleration data. The map produced by Valkaniotis Sotiris hints that this might be the case.
Other posts that might be of interest:
- Geonet commentary on landslides triggered by the Kaikoura Earthquake
- Kaikoura earthquake landslides: the picture slowly emerges
- First news of landslides from the Kaikoura Earthquake sequence in New Zealand yesterday
- Hapuku River: a major landslide dam after the earthquake in New Zealand
- Comparing initial landslide reports: Tumbi Quarry, Papua New Guinea and Kaikora, New Zealand
- Landslides from the 2015 Wilberforce earthquake in New Zealand
- UBC distinguished lecture powerpoint file: Earthquake-induced landslides – lessons from Taiwan, Pakistan, China and New Zealand