For me the most important geo news this week was the court decision on the L’Aquila trial on Monday. A local court sentenced six scientists and one official for manslaughter to six years in prison – 2 years more than claimed by the prosecutor. Even though the scientists may not have found the best words to describe the earthquake hazard in L’Aquila, the decision is ridiculous in my opinion and caused an outcry throughout the scientific community. Especially the consequences for any risk assessment and public information might be fatal. I am really concerned. In the following I link to some blog posts that I found particularly interesting:
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Annals of Geophysics, the former Annali di Geofisica, published its latest issue today, dedicated to the 2012 Northern Italy earthquakes: Vol 55, No 4 (2012): The Emilia (northern Italy) seismic sequence of May-June, 2012: preliminary data and results. On 20 May 2012 an earthquake with a magnitude of Mw6.1 hit Finale Emilia, on 29 May an Mw5.8 event followed. The earthquakes caused a number of fatalities and significant damage. Earthquake environmental effects were widely observed, too. more
Nature published three articles on the Sumatra April 2012 mega-strike-slip earthquakes. I am pretty sure that at least one of them will be discussed intensely. Earlier this year, two earthquakes with magnitudes of M8.6 and M8.2, respectively, occurred in the Indian Ocean off Sumatra. The epicentres were close to the epicentral area of the 2004 Christmas event, but further to the SW and entirely on the Indo-Australian plate. This was surprising for many reasons: We did not expect such strong strike-slip quakes, we did not expect them to happen intraplate, and we were surprised by the complex en echelon and orthogonal fault pattern. more
In the frame of the forthcoming international workshop “Out of Rubble: Interdisciplinary Perspectives on Minoan Earthquakes” (Leuven, Belgium, 29-30 November 2012), we welcome poster proposals on the topic “Ancient Geohazards in the Eastern Mediterranean”. Posters should address any issue related to the definition of ancient geohazards in the Eastern Mediterranean (e.g. tsunamis, earthquakes, volcanic eruptions, extreme climatic events).
More information: click here
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Today’s Friday links are mostly about cake geology and scientists playing with food, but let’s start with something different. Yesterday, volcano Fuego (“fire”) erupted in Guatemala and produced an impressive column of ash and smoke. This beautiful stratovolcano is only 40 km from Guatemala City and one of the most active volcanos of Central America. more
The Sparta Fault in Greece is marked by one of the most impressive mountain fronts I’ve ever seen. A huge (yes, huge!) fault scarp has developed, traceable for kilometers; the fault itself is more than 60 km long. Ancient Sparta has been devastated by the last known major (M>7) earthquake that happened at this fault in 464 BC. Now, Papanikolaou et al. have published new data on this fault. They examined how paramaters like throw, segmentation, and catchments vary along strike and created a new seismic hazard map, showing a site-specific long-term recurrence interval of ~1.8 ka (+/- 450 a). more
A new paper has been published online first by Hinzen et al. on their archeoseismological study in Cologne, Germany. During recent archeological excavations, a number of damaged structures from Roman to Medieval times have been discovered and described among them a synagoge, the Praetorium, and a Roman well. Since damaging historical earthquakes are documented for the Lower Rhine Embayment, seismic shaking was a good guess to have caused the observed damage. more
This Friday a series of four major earthquakes happened in the border region of Sichuan, Guizhou and Yunnan provinces, S China. At least 80 fatalities and almost 800 injured were recorded, the China Earthquake Administration states. International journals confirm these news. Associated landslides were reported. more
Two really strong earthquakes happened yesterday at the Mid-Atlantic Ridge in the Jan Mayen Islands area. The first one had a magnitude of M6.6, the second one, around ten minutes later, had M5.3. Moment tensor solutions show clear strike slip along a transform fault west of the ridge. The seismicity map shows that events like yesterday’s don’t come as a suprise: more
One of the coolest things I recently read about was the Syracuse University Lava Project. I mean, how cool is it to produce your own lava at 1200°C and to let it flow on Campus? Pretty cool. And, as you can see on these images, it is a great way to teach children how cool geoscience is. Watch the beautiful structures developing when the lava cools down: more
