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The following preliminary information is available for this earthquake:DATE : 28 April 2007ORIGIN TIME : 07:18 10.0s UTCLAT/LONG : 50.97º North / 1.38º EastGRID REF : 636.9 kmE / 124.4 kmNDEPTH : 5.0 kmMAGNITUDE : 4.3 MLINTENSITY : 6 EMSLOCALITY : Dover Straits, 14km south of DoverThis is the largest event detected in the region since a magnitude 4.4 ML earthquake in 1950. Large earthquakes have also occurred in the region in the historical past in 1382 (magnitude 5., 1580 (magnitude 5. and 1776 (magnitude 4.1).
Yousaf,Thank you for joining and asking this question. Welcome!The earthquake in 2005 shook the ground so hard that rocks came apart and slid down the valley the river runs in. The white color is the color of the rock when it is freshly broken. As it sits on the ground for years and years, a process called "weathering" takes place. It causes chemical changes that make the rock get darker. It is the same when you buy a new copper pot or tray. It is shinny and looks very nice. But if it gets broken and is thrown out it will turn green over a long time. On Google maps, the darker the rocks you see are, the longer the surface has been stable. The whiter they get, the newer the surface.