The German research vessel R/V Polarstern is an ice-breaking mega laboratory and the heart of the German arctic and antarctic research. It is maintained by the AWI Bremerhaven (Alfred Wegener Institut for Polar and Marine Research). When I studied Geophysics at Leipzig University, I had to chance to visit this great ship during an excursion. Now the Polarstern is on her way for the Antarctic again, and this time the ship and the crew will spend the winter down far south for the very first time. Follow their campaign via the AWI blog or the GEO blog.
Our colleagues from the Bulgarian Academy of Science, Geological Institute “Strashimir Dimitrov“, have published a report on the coseismic and secondary effects of the May 22, 2012 Pernik earthquake, Western Bulgaria. The earthquake had a magnitude of MW5.6, see this special website of EMSC. Radulov et al. report intensities of up to VII (MSK) and various coseismic and secondary earthquake effects. Continue reading “Report on the coseismic and secondary effects of the May 22, 2012 Pernik EQ, Mw5.6, W Bulgaria”
Some days ago a new paper on the paleoseismicity of the Dead Sea area during the late Holocene has been published in JGR. Kagan et al, 2011 investigated two new study sites in the northern and southern parts of the Dead Sea Basin and compared the seismites found there with the information of the Ein Gedi core presented by Migowski et al., 2004.
Thanks to Alessandro I came across this incredible video of liquefaction occuring in the Tokyo Central Park during the M9.0 Japan earthquake. We can see a lot of very interesting features. First, cracks are opening, perfectly visible on the paved road and the cobble. Then we see the differential moving along those cracks, they are widening and narrowing and there’s vertical movement as well. Soon, the first ruptures appear in the meadows, despite the soft sediment there. Continue reading “Liquefaction in Tokyo Central Park”
The Japan M9.0 earthquake and the following tsunami are well documented by videos, photographs, sea-level measurements, seismograms etc. But how do we recognize such huge events if they happened some thousands of years ago? If there’s no historical report we would use earthquake environmental effects (EEE) for characterizing the earthquake and paleoseismicity. Let’s look what would be left from a 5000 year old earthquake and tsunami. Continue reading “Japan EQ & Tsunami: Environmental Effects”
An earthquake with a magnitude of Mw9.0 has occured 130 km east of Honshu, Japan in a depth of ~25 km. This had been the fourth or fifth strongest earthquake to be recorded by instrumental seismology. The quake caused significant destruction to the Honshu Island and triggered a tsunami that destroyed a number of harbours. In some places (Sendai), tsunami heights were reported to exceed 10 m. A tsunami warning has been released for wide parts of the Pacific, but in Hawaii only 1 m was observed, therefore the warnings for the US West Coast have been lowered. Continue reading “Mw9.0 earthquake hits Japan, causes Tsunami (updated – 3)”
A M6.3 earthquake hit Christchurch, New Zealand on 22 February (21 Feb in UTC), leaving at least 75 people dead and hundreds injured or missing. Hundreds of houses were destroyed, including the Christchurch Cathedral, and damages will probably sum up to some billion dollars. On 4 September 2010 (3 Sept in UTC), a M7.0 event struck Christchurch, but then no one was killed. So: what’s the difference between the two events?