You are browsing the archive for Tag: satellite - Page 7 - The Landslide Blog.
16 September 2010
Zhouqu landslide – NASA satellite image
NASA have somehow managed to find a gap in the clouds to collect a satellite image of the Zhouqu landslide site. Readers at the time of the landslide last month will remember that I was wondering about the source of the slides. Although this image does not give a full answer, it gets us a part of the way there: A zoom into the affected area yields this: The slides …
15 August 2010
Pakistan flood update – 15th August 2010
The second flood wave is now starting to affect the most devastated areas of Sindh. The PakMet FFD hydrograph for Guddu has started to show an increase in discharge once again: Note that the flood level has been above the exceptionally high (danger) level for ten days now. Downstream at Sukkur the water level continues to fall very slowly, again remaining well above the danger level: Expect this to start …
24 November 2009
More El Salvador lahar satellite imagery
In an earlier post today I highlighted the availability of satellite imagery covering the El Salvador lahar disaster, triggered by Hurricane Ida earlier this month. Whilst sitting in a conference session this morning it occurred to me that the Disaster Charter, which provides satellite images for disaster relief and recovery operation, was also triggered by this event. So I had a quick look at the web page for this triggering …
Satellite imagery of the El Salvador lahars
NASA has released before and after satellite images of the lahars (volcanic debris flows) triggered by Hurricane Ida in El Salvador earlier this month. The final toll of the landslides remains unclear, over 60 is the widely reported statistic. The images are false colour composites collected by the ASTER instrument. These images differentiate between vegetation, which appears as red colours, and bare ground, which appear as a blue-grey colour. Such …
3 June 2009
Are satellite-based landslide hazard algorithms useful?
In some parts of the world, such as the Seattle area of the USA, wide area landslide warning systems are operated on the basis of rainfall thresholds. These are comparatively simple in essence – basically the combination of short term and long term rainfall that is needed to trigger landslides is determined, often using historical records of landslide events. A critical threshold is determined for the combination of these two …
15 January 2009
Guatemala landslide – new satellite image
The Advanced Land Imager instrument of the NASA Earth Observation satellite EO-1 has recently collected an image of the Guatemalan landslide, which they have made available online. The image is here. I have cropped it to show just the slide – it is quite useful:
17 May 2008
Satellite imagery of the landslides in the Sichuan earthquake
Now that there is a brief weather window, satellite imagery is starting to emerge of the Sichuan Earthquake zone. At present most of these images are too low resolution to allow detection of the real damage to the buildings (which is notoriously difficult to achieve), but they are excellent for looking at landslides. The best to date that I have seen has come from the Taiwanese Formosat-2 instrument, which is …
Dave Petley is the Vice-Chancellor of the University of Hull in the United Kingdom. His blog provides commentary and analysis of landslide events occurring worldwide, including the landslides themselves, latest research, and conferences and meetings.
Recent Comments