Quite alarming reports started to emerge yesterday that the dam at Tangjiashan might now be “leaking”. For example, a correspondent in Japan, Hideo Ototake, sent me a link to this website, which suggests that a leak started at the bottom of the dam in the afternoon of 1st June. Reuters today is carrying this report, which states that:“The largest “quake lake” formed by China’s most devastating earthquake in decades is …

The map below shows the distribution of fatal landslides for May 2008. At the moment I am not including the landslides associated with the Sichuan earthquake as I cannot yet estimate the impacts of them. Clearly the numbers of landslides and the numbers of fatalities will dwarf the numbers below. I will try to ascertain the magnitudes in due course, though this is very challenging. I have included reported rainfall-triggered …

The BBC is carrying some interesting footage of soldiers creating a channel across a landslide deposit. This can be seen here: http://news.bbc.co.uk/1/hi/world/asia-pacific/7421263.stm The video is at the bottom of the page. It is worth a look. The video shows soldiers digging a channel through what is apparently a landslide deposit. I am not sure which landslide this is or even what the channel is to achieve. It could be that …

China Daily is today reporting that real progress is being made with the lake above Beichuan, which is now known as Tangjiashan Lake: Amid low visibility, a Russian helicopter successfully delivered a large bulldozer and other eight sets of big machineries near the swelling Tangjiashan lake, in order to dig a diverting channel to prevent a flood, said Minister of Water Resources Chen Lei. “I feel relieved this morning as …

CCTV has posted the following image of the lake at Beichuan: Meanwhile Reuters have published this image, captioned: “An aerial view of the roofs of houses in earthquake-hit Beichuan, Sichuan province May 20, 2008. The houses, which were originally built next to a reservoir, were uprooted and floated downriver after water levels started to rise.” I suspect that by reservoir they mean river? AP has this image of the landslides …

The FORMOSAT-2 image of the Beichuan area is now available on Google Earth (see here). The image is interesting as it shows that the landslides were incredibly spatially variable – for example, in the Beichuan area (which is junction of the rivers on the middle right of the image – the Google label is a little way from the main part of the town) the occurrence of landslides is very …

I am not normally a fan of Chicken Noodle News (CNN), but they have an interesting report detailing the damage in Beichuan resulting from the impact of the rockslide. It is worth a view. I cannot find a way to link to the original report, but there is a good quality version of it here. AP image captioned: Rescue workers search collapsed buildings in Beichuan, China’s southwest Sichuan province, Sunday …

I thought it would be useful to summarise the key issues / threats associated with landslides in the aftermath of the Sichuan earthquake that I can see at the moment: Delayed landslides from the main earthquake: there is some evidence that there can be a substantial delay between the earthquake and occurrence of large-scale landslides. This is because: i) in some cases pore pressures in slopes take some days to …

Reports and images are now emerging of the complete burial of three villages, Donghekou, Ciban and Kangle, located on the Qingzhu river in Sichuan Provinc as a result of (separate) landslides in the Sichuan Earthquake. In particular, images are now available of Doghekou, which is one of the landslides that has blocked the river upstream of Beichuan. These three landslides have together entombed an estimated 300 families, which would indicate …

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 …