کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6432538 1635435 2014 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Coseismic landsliding during the Mw 7.1 Darfield (Canterbury) earthquake: Implications for paleoseismic studies of landslides
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Coseismic landsliding during the Mw 7.1 Darfield (Canterbury) earthquake: Implications for paleoseismic studies of landslides
چکیده انگلیسی


- We documented coseismic ground cracks following the Darfield (Canterbury) earthquake.
- Mapping and subsurface data indicate toppling and bedding-controlled translation.
- Ground crack displacement and depth may be controlled by topography.
- Paleoseismic studies of landslides must account for source and site characteristics.

The head scarp of the Harper Hills landslide consists of ground cracks with vertical displacement and extension that opened during the 2010 Darfield (Canterbury) Mw 7.1 earthquake. The geomorphology of the cracks, regional geology and ground penetrating radar indicate that the landslide formed by bedding-controlled translation and joint-controlled toppling, and suggest incipient deep-seated movement. Crack depth and displacement along the head scarp vary along the ridge; maximum values are located where the head scarp is closest to the local ridge line. Increased seismic shaking due to topographic and geometric amplification of seismic waves is suggested as an explanation for this relationship. An excavation across the head scarp revealed no evidence of prior slip events over a time period that is likely to exceed the return period (1000-2500 years) of peak ground accelerations experienced at this location in the Darfield earthquake. We suggest that specific seismologic attributes of the Darfield earthquake may have influenced the location of landsliding in this instance. Studies of paleo-landslides must consider crack preservation potential as well as complex source/site effects that may complicate estimates of acceleration return periods from the subsurface investigation of individual landslide head scarps.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 214, 1 June 2014, Pages 114-127
نویسندگان
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