 |
| Titel |
Analysis of the relationship between landslides size distribution and earthquake source area |
| VerfasserIn |
Andrea Valagussa, Giovanni B. Crosta, Paolo Frattini, Chong Xu |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100344
|
| Publikation (Nr.) |
 EGU/EGU2014-16281.pdf |
|
|
|
|
|
| Zusammenfassung |
| The spatial distribution of earthquake induced landslides around the seismogenetic source has
been analysed to better understand the triggering of landslides in seismic areas and to forecast
the maximum distance at which an earthquake, with a certain magnitude, can induce
landslides (e.g Keefer, 1984).
However, when applying such approaches to old earthquakes (e.g 1929 Buller and 1968
Iningahua earthquakes New Zealand; Parker, 2013; 1976 Friuli earthquake, Italy) one should
be concerned about the undersampling of smaller landslides which can be cancelled by
erosion and landscape evolution. For this reason, it is important to characterize
carefully the relationship between landslide area and number with distance from the
source, but also the size distribution of landslides as a function of distance from the
source.
In this paper, we analyse the 2008 Wenchuan earthquake landslide inventory (Xu et al,
2013). The earthquake triggered more than 197,000 landslides of different type, including
rock avalanches, rockfalls, translational and rotational slides, lateral spreads and derbies
flows.
First, we calculated the landslide intensity (number of landslides per unit area) and spatial
density (landslide area per unit area) as a function of distance from the source area
of the earthquake. Then, we developed magnitude frequency curves (MFC) for
different distances from the source area. Comparing these curves, we can describe the
relation between the distance and the frequency density of landslide in seismic
area.
Keefer D K (1984) Landslides caused by earthquakes. Geological Society of America
Bulletin, 95(4), 406-421.
Parker R N, (2013) Hillslope memory and spatial and temporal distributions of
earthquake-induced landslides, Durham theses, Durham University.
Xu, C., Xu, X., Yao, X., & Dai, F. (2013). Three (nearly) complete inventories of
landslides triggered by the May 12, 2008 Wenchuan Mw 7.9 earthquake of China and their
spatial distribution statistical analysis. Landslides, 1-21. |
|
|
|
|
|
|