Updated Historic Seismicity: Nepal, Himalayas (3 data sets)

I have added one more polygon data set to the three main data sets that include records of historic earthquake slip patches. The three data sets now include Bilham (2004), Bettinelli et al (2006), and Berryman et al. (2009). I left the Rajendran and Rajendran (2011) data set off of this map because it is a point data set and the locations do not lie within the polygons from the other studies. While this may not be evidence alone, but the city locations plotted in the Rajendran article are also plotted incorrectly.

    The methods that I used to digitize these data sets involves the following:

  1. step (1) I georeferenced the maps by rubbersheeting them in arcGIS (into a WGS84 lat/long coordinate system). In some cases, I could use lat/long coordinates plotted on the original maps. In other cases I used nation-state boundaries, topographic landforms, and coastal shorelines. These maps are all probably within tens of kms of being in the correct location.
  2. step (2) I screen digitized the polygons as plotted in the referenced articles.


    References:

  • Bilham, R., Gaur, V.K., Molnar, P., 2001. Himalayan Seismic Hazard, Science, v. 293, p/ 1,442-1,444.
  • Bilham, R., 2004. Earthquakes in India and the Himalaya: tectonics, geodesy and history, Annals of Geophysics, v. 42, no. 2/3, p. 839-858.
  • Bettinelli, P., Avouac, J-P., Flouzat, M., Jouanne, F., Bollinger, L., Willis, P., and Chikitrar, G.R., 2006. Plate motion of India and interseismic strain in the Nepal Himalaya from GPS and DORIS measurements, Journal of Geodesy, v. 80, p. 567-589
  • Berryman, K., Ries, W., Litchfield, N. (2014) The Himalayan Frontal Thrust: Attributes for seismic hazard Version 1.0, December 2014, GEM Faulted Earth Project, available from http://www.nexus.globalquakemodel.org/.
  • Rajendran, K and Rajendran, C.P_., 2011. Revisiting the earthquake sources in the Himalaya: Perspectives on past seismicity, Tectonophysics, v. 504, p. 75-78.
Category(s): Chemeketa Community College, collision, education, geology, HSU, plate tectonics

3 Responses to Updated Historic Seismicity: Nepal, Himalayas (3 data sets)

  1. thank you. Very interesting!

6 Responses in other blogs/articles

  1. […] Well, there have been a few more aftershocks over night… Here is my first post about these aftershocks (I provide more links to the USGS web sites). Plus, the USGS has inverted the seismic data to estimate a fault plane (with estimated slip on the fault). They also updated their shaking intensity maps and PAGER estimates to reflect results of modeling slip and ground motions upon this fault plane. Below I plot the new Modified Mercalli Intensity data (in red, not the typical MMI color scale). I also include the Hough and Bilham (200 slip model for the 1934 earthquake. It appears as though this 2015 swarm overlaps slightly with the 1934 slip patch (less so than the other two 1934 slip patches). Previously I had plotted other historic earthquakes on a regional map. […]

  2. […] Well, there have been a few more aftershocks over night… Here is my first post about these aftershocks (I provide more links to the USGS web sites). Plus, the USGS has inverted the seismic data to estimate a fault plane (with estimated slip on the fault). They also updated their shaking intensity maps and PAGER estimates to reflect results of modeling slip and ground motions upon this fault plane. Below I plot the new Modified Mercalli Intensity data (in red, not the typical MMI color scale). I also include the Hough and Bilham (2008 ) slip model for the 1934 earthquake. It appears as though this 2015 swarm overlaps slightly with the 1934 slip patch (less so than the other two 1934 slip patches). Previously I had plotted other historic earthquakes on a regional map. […]

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