Posts in the category »  Uncategorized «  ( 54 Posts )

  • We mourn the passing of Prof. Dr. Victor Hugo Garduño Monroy

    Dear colleagues,

    It is with great sadness that we received note from the passing of our dear colleague Victor Hugo Gorduño Monroy.

    Victor was a close friend to many of us and an outstanding person in the Mexican scientific community. He authored a great number of publications on the geology of Mexico, on tectonics, volcanism, and hazards. His work did not only advance geosciences, but also had huge impact on society. He was tireless in helping to raise the awareness for disasters and to promote geoscience in the public. We will never forget his enthusiasm and his dedication in the field.

    He had the leading role in geosciences at the Michoacan University of San Nicolás de Hidalgo and taught hundreds of students during his career.

    Victor organized the first PATA days outside Europe in November 2012 in Morelia in commemoration of the 1912 Acambay Earthquake, which was an absolute pleasure and a great success.

    Our thoughts are with his family and with everyone who worked closely with him.

    The Michoacan University of San Nicolás de Hidalgo released the following letter of condolence:

    El día de hoy sufrimos la pérdida de una de nuestras más sólidas columnas institucionales. Informamos con profunda tristeza que el Dr. Víctor Hugo Garduño Monroy falleció esta mañana y con él perdimos a nuestro Líder Académico y Fundador de la Maestría en Geociencias y Planificación del Territorio y del Instituto de Investigaciones en Ciencias de la Tierra. El Dr. Garduño fue un incansable investigador de la Geología de nuestro Estado y del Occidente de México. Formador profesional de centenares de estudiantes a nivel profesional y posgrado. Ganador de la Presea José María Morelos y Pavón y Primer Investigador en Obtener la Presea Vasco de Quiroga en nuestra querida Universidad Michoacana de San Nicolás de Hidalgo. Hoy se fue uno de los mejores investigadores de nuestra Universidad, de nuestro Estado y de nuestro País. Siempre será recordado por el cariño a su profesión, a sus estudiantes y compañeros. Descanse en Paz.

    Victor (right) with his friends and colleagues during the 2012 PATA Days in Morelia, Mexico.
  • Landslides triggered by multiple earthquakes – a Matlab code

    Moderate to strong earthquakes commonly produce secondary effects (landslides, liquefaction, tsunamis), which worsen the impact of the seismic event, both during the emergency and recovery phases.

    Landslides can be triggered by events of M above 5 or so, and stronger events can produce thousands of landslides. Landslide inventories were compiled for dozens of events and the relations between Mw and maximum distance or area affected by landslides have been analyzed (e.g., Keefer, 1984; Rodriguez et al., 1999). On the other hand, the total area affected by landslides is one of the metrics used to assign the ESI intensity (Environmental Seismic Intensity; Michetti et al., 2007).

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  • Hokudan 2020 International Symposium on Active Faulting, 13-17 January, Awaji, Japan

    The Hokudan 2020 International Symposium on Active Faulting will take place from 13-17 January in Awaji City, Awaji Island, Japan. The symposium is held every five years. The 2020 event commemorates the 25th anniversary of the 1995 Kobe earthquake. All important information on this meeting is available here: https://home.hiroshima-u.ac.jp/kojiok/hokudan2020.html

    This event is supported by INQUA – the International Union for Quaternary Research and its TERPRO commission. For more information, please contact Koji Okumura (kojiok@hiroshima-u.ac.jp) or Shinji Toda (toda@irides.tohoku.ac.jp).

    Deadline for abstract submission is 1 December, 2019.

  • Paleoseismology field trip and theme session at the 36th International Geological Congress – IGC, Delhi

    During the 36th IGC in Delhi there will be a symposium on “31.2 Paleoseismology of the Frontal Himalayan Fold and Thrust Belt and Earthquake Hazards” in the Geohazards Theme 31. Abstract submission is free until 15th Sept. 2019 and open until 15th Oct. 2019.

    There will also be a field trip “Paleoseismology along the Foothill Zone of Central Himalaya, Uttarakhand, India” from 25-29 Feb. 2020, Field Trip Code NR013.

  • Ridgecrest & Searles Valley earthquakes: a fault displacement hazard analysis

    On July 4th and 5th, 2019 two earthquakes (Mw 6.4 and Mw 7.1, respectively) occurred in eastern California and produced distinct surface ruptures. Field surveys started immediately after the first event and, less than two weeks later, a provisional map of surface rupture was compiled and made available to everyone (Contributors from USGS, CGS, UNR, USC, CSUF). I downloaded the map and kmz files of the ruptures from the SCEC response site, which contains tons of fruitful information.

    The two strike-slip earthquakes ruptured two perpendicular faults, the first running NE-SW with left-lateral slip and the second running NW-SE with right-lateral slip (Figure 1). The location of the earthquake falls within the Eastern California shear zone, a region of distributed faulting associated with motion across the Pacific-North America plate boundary, and an area of high seismic hazard.

    Figure 1. Left: ground breaks caused by the 2 earthquakes. Right: simplified trace, used as main fault.

    Ruptures come with a variable degree of complexity: some sectors show a “simple” single strand, others show multiple sub-parallel or diverging splays. Distributed faulting represents displacements occurred off the principal fault and is generally made up by less continuous ruptures, which can be located tens of meters to a few kilometers from the principal fault trace. A method to evaluate the fault displacement hazard has been proposed by Youngs et al. (2003) and later refined by Petersen et al. (2011); the former study analyzed normal faults, while the latter analyzed strike-slip faults.

    Basically, the method defines the conditional probability of faulting occurrence as a function of distance from the principal fault and derives scaling relations between rupture probability and distance. I applied the same method on the 2019 sequence and compared the output with the results by Petersen; results are grid-dependent – since available data are still provisional, I used a quite coarse grid size of 200 m, more detailed studies will come.

    Results are in good agreement (Figure 2): the 2019 ruptures show a higher than average rupture probability at 0-2 km from the main fault, but also taper out faster than the previous events.

    Figure 2. Comparison between the 2019 events (blue: July 4th; red: July 5th) and data by Petersen et al. (empty circles). The probability of occurrence of faulting is plotted as a function of distance from the main fault (left: linear horizontal axis; right: logarithmic scale).

    References:

    Petersen, M. D., et al. (2011). Fault displacement hazard for strike-slip faults. BSSA, 101(2), 805-825.

    Youngs, R. R., et al. (2003). A methodology for probabilistic fault displacement hazard analysis (PFDHA). Earthquake Spectra, 19(1), 191-219.

  • PATA Days 2020 in Chile, 8-12 November – 1st circular

    The next INQUA meeting on Paleoseismology, Archaeoseismology, and Active Tectonics (PATA Days) will be held in Hornitos, Chile, from 8-12 November, 2020. Download the 1st circular here (PDF, 400 kb).

    See you all in Chile 2020!

  • International meeting in commemoration of the 20th Anniversary of the 1999 Marmara Earthquakes

    Dr. Gülsen Ucarkus send us the first circular for the following interesting meeting:

    We would like to invite you to the international meeting organized by Active Tectonics Research Group (ATAG) of Turkey in commemoration of 20th Anniversary of 1999 Marmara Earthquakes. Following these two devastating earthquakes (1999 Mw 7.4 İzmit and 1999 Mw 7.2 Düzce Earthquakes), a vast number of international/national projects carried out in the Marmara Sea region of Turkey and the outcomes of research done contributed significantly to multi-disciplinary studies in active tectonics. The meeting aims to revisit the results of these important number of observations together with new research going on to highlight the current state of seismic hazard in Marmara Sea where the next big earthquakes is expected to occur.

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  • New papers on paleoseismology, earthquakes, and active tectonics (Feb 2019)

    New year, new science! These are the latest papers on paleoseismology, earthquakes, and active tectonics. Enjoy reading!

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  • PhD and postdoc positions available at Pukyong National University, South Korea – active faults and seismic hazard

    These are great opportunities for PhD students and postdocs. A huge research programme in South Korea is now devoted to investigate the active faults of the country and to understand the seismic hazard, after two damaging earthquakes hit the country recently.

    Recruiting PhD Research Student and Postdoctoral Researcher

    Starting from March 2019, ‘The Korean Active Fault Research Group (KAFRG)’ and ‘The Institute of Active Fault and Earthquake Hazard Mitigation (IAFEHM)’ at Pukyong National University in South Korea are looking for competent and enthusiastic research students and geologists for PhD and Post-doc.

    Our research group and institute are currently leading active fault investigations and researches in South Korea. We also have been implementing collaborative researches with various domestic and overseas universities and research institutes. The ongoing main projects of our research group are ‘Investigation of active faults on the Korean Peninsula’ and ‘The safety evaluation for geological conditions and earthquake hazard for nuclear power plant sites and waste disposal facilities.’

    The initial employment – contract period is 1 year, and depending on the researcher’s achievement and contribution to the group the working year(s) can be extended. The annual salary will be arranged according to the researcher’s research experiences and the performances. more

  • PATA2018 Summer School: Special rates for students

    The #PATA18 workshop will be held from 25-27 June and the Summer School will take place on 28 June. Under- and post- graduate students can now attend both these events, with special rates:

    • Workshop (25-27 June): 30 Euros (attendance only)
    • Summer School (28 June): 30 Euros (attendance plus two meals)
    • Workshop + Summer School combo: 50 Euros.

    There is also the possibility to stay at the Aristotle University camping ground at a very low price, by bringing your own tent or renting one on site. To register for these events and for more information, please contact Ass. Prof. Alexandros Chatzipetros at ac@geo.auth.gr no later than Jun 15th, 2018. more

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