Posts in the category »   «  ( 219 Posts )

  • New papers on paleoseismology, earthquakes, and active tectonics (Aug 2020)

    This time we have a number of studies on historical earthquakes, active tectonics studies from all around the world, a view review and methods articles, and plenty of tsunami stuff. Make sure to check out the new book on the geological record of extreme waves! Enjoy reading and let us know in case we’ve missed something.

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  • New papers on paleoseismology in the Tien Shan

    Between 1885 and 1938, the northern Tien Shan at the border between present Kyrgyzstan and Kazakhstan experienced a remarkable series of five major earthquakes, exceeding M6.9 and reaching up to M ~ 8 (1885 Belovodskoe M6.9, 1887 Verny M7.3, 1889 Chilik M~8, 1911 Chon Kemin M8, and 1938 Kemino Chu M6.9). Combined, the seismic moments add up to almost moment magnitude 9, which is a significant amount of strain released in roughly 50 years and across an E-W stretch of less than 500 kilometers. Even more intriguing is the fact that the ruptured region is located more than thousand km north of the nearest plate boundary and associated India-Eurasia collision zone. The macroseismic areas of these earthquakes include the present-day capital of Kyrgyzstan, Bishkek (Frunze) and the former capital and still largest city of Kazakhstan, Almaty (earlier names Alma Ata and Verny).
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  • Guest blog by Sascha Schneiderwind (RWTH Aachen University): Multiparametric trenching investigations

    [Update 15 February 2017: Since Sascha is an author here now, the post was attributed to him.]
    Greece is one of the main targets of RWTH Aachen’s Neotectonics & Geohazards group. They worked on paleo-tsunamis, active faults on the Peloponnese, in Attica, and on Crete, and on the application of terrestrial LiDAR and shallow geophysics for active tectonics research. In their latest paper, Sascha Schneiderwind et al. developed a methodology to aid paleoseismic trenching studies. They use t-LiDAR and georadar to better and more objectively characterise lithological units. His paper includes nice examples from Crete and from the famous Kaparelli Fault. Here is his guest blog: more

  • A Holocene surface rupture in Germany

    I am quite happy that our new paper has finally been published in GJI. We worked on a fault between Aachen and Cologne in Germany and found that there has been a surface rupturing earthquake less than 9000 years ago, and possibly not much older than 2500 years BP. The area is of interest also because in 1755/56 a series of damaging earthquakes hit Düren and its surroundings – these are the strongest historical events in Germany that we know of. The quakes were felt as far away as Berlin, Strasbourg, and London, yet there were no primary ruptures. “Our” quake must have been much stronger… more

  • Guest blog: “Photogrammetry for Paleoseismic Trenching” by Nadine Reitman (USGS)

    A few weeks ago, Nadine Reitman (USGS) published an interesting paper about the use of Photogrammetry for Paleoseismic Trenching in BSSA. In this guest blog she shares her key findings and explains how to minimise errors without spending too much time measuring control points. Thanks Nadine!

    Structure-from-motion (SfM) is now routinely used to construct orthophotos and high-resolution, 3D topographic models of geologic field sites. Here, we turn SfM on its side and use it to construct photomosaics and 3D models of paleoseismic trench exposures. Our results include a workflow for the semi-automated creation of seamless, high resolution photomosaics designed for rapid implementation in a field setting and a new error analysis of SfM models. more

  • What’s up? The Friday links (90)

    Trenches are open all over the world, news on the next TSG meeting (in London), a landslide database visualisation, and more. Today is Friday and here are your links!

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  • What’s up? The Friday links (71)

    And again it’s almost the start of a weekend! I collected some nice links for you, I hope you like them. Today is Friday and here are your links!

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  • A climbing snake in Jim McCalpin’s paleoseismological trench

    In Mai 2013, Jim McCalpin’s field course on Field Methods in Neotectonics and Paleoseismology took place in Crestone, CO. Our friend Jack Mason from the Institute of Neotectonics and Natural Hazards of RWTH Aachen University took part and sent me this amazing video. They encountered a bullsnake in the paleoseismological trench! Surprisingly, the snake decided to climb out of the trench via the vertical wall.  more

  • Field work on active faults in Greece

    I am currently in Greece for field work on faults in the vicinity of Athens. Sascha from RWTH Aachen University is doing his MSc. thesis on remote sensing, geophysical analyses, and mapping of some structures that we think could be active, and me and Ioannis are with him in the field for the first few days. Right on the first day we found some promising outcrops which we will map and check in detail during the next days. more

  • Field Course in Neotectonics & Paleoseismology – May 22-31, 2013 in Crestone, Colorado, USA

    Jim McCalpin will teach his 13th Field Course in Neotectonics and Paleoseismology from May 22-31, 2013 in Crestone, Colorado, USA. This is a “9-day summer Field Course, offered by the Crestone Science Center, which teaches the latest field techniques, but also contains evening lectures covering the entire field of Paleoseismology.” more

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