An example of science aided by cyberinfrastructure geodynamics of the himalaya
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An example of science aided by cyberinfrastructure - Geodynamics of the Himalaya . Chris Andronicos Institute for the Study of the Continents, Cornell University and Aaron A. Velasco, Jose M. Hurtado Department of Geological Sciences University of Texas at El Paso.

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An example of science aided by cyberinfrastructure geodynamics of the himalaya

An example of science aided by cyberinfrastructure - Geodynamics of the Himalaya

Chris Andronicos

Institute for the Study of the Continents, Cornell University

and

Aaron A. Velasco,

Jose M. Hurtado

Department of Geological Sciences

University of Texas at El Paso


Can you do science with what is already out there
Can you do science with what is already out there? Geodynamics of the Himalaya

  • The Internet provides access to a vast amount of data in various subjects but…

    • The data is usually not peer reviewed

    • Some available information is of dubious nature

    • Data is often available in formats which are difficult to utilize for the problem of interest

    • Data may be out of date


Datasets and programs used
Datasets and Programs Used Geodynamics of the Himalaya

  • Harvard Centroid Moment Tensor

  • World Stress Map

  • Shuttle Radar Topography Mission

  • Generic Mapping Tools

  • Commercial software and publicly unavailable data

  • Motivated by results of computer generated geodynamic models


World stress map
World Stress Map Geodynamics of the Himalaya

  • Extensive Database of on the state of stress in the earth from geological and geophysical data

  • http://www-wsm.physik.uni-karlsruhe.de/pub/home/index_noflash.html


Harvard centroid moment tensor catalogue
Harvard Centroid Moment Tensor Catalogue Geodynamics of the Himalaya

  • Extensive global database of focal mechanisms with magnitude greater than 5.5 since 1977

  • Easy search functionality


Shuttle radar topography mission srtm
Shuttle Radar Topography Mission (SRTM) Geodynamics of the Himalaya

  • Provides elevation data at 30 m resolution for much of the earth

  • Easy to produce digital elevation models for large regions

  • http://srtm.usgs.gov/


Outline
Outline Geodynamics of the Himalaya

  • Earthquakes and Strain Partitioning

  • Depth Distribution of Earthquakes

  • Earthquakes and topography

  • Conclusions


Earthquake kinematics
Earthquake Kinematics Geodynamics of the Himalaya

  • A focal mechanism for an earthquake gives the orientation of the greatest compression (P) and least compression (T) axis

  • Based on the orientations of the P and T axis we can divide the earthquakes into kinematic types

  • Data source: Harvard Centroid Moment Tensor catalogue and World Stress Map


Kinematic types
Kinematic Types Geodynamics of the Himalaya


Strike-Slip Fault P-axis Geodynamics of the Himalaya


Thrust Fault P-axis Geodynamics of the Himalaya


Transpressive Fault P-axis Geodynamics of the Himalaya


Normal Fault T-axis Geodynamics of the Himalaya


Transtensive Fault P-axis Geodynamics of the Himalaya


Kinematic Domains Geodynamics of the Himalaya


Depth distribution of earthquakes
Depth Distribution of Earthquakes Geodynamics of the Himalaya

  • Dataset developed for CTBT verification (Bombs)

  • Only events that included a depth phase (pP or sP) were included

  • Data set includes 26 “ground truth events” developed by bomb monitoring community

  • Possible to map brittle & ductile strain

  • Work by Steck, Velasco and others, 1997


Beaumont et al., Nature Geodynamics of the Himalaya


Relief Map Geodynamics of the Himalaya

Data Source-SRTM


A Possible Explanation Geodynamics of the Himalaya


Conclusions
Conclusions Geodynamics of the Himalaya

  • Major faults in Tibet bound regions of transtension that are likely underlain by a fluid lower crust which is flowing eastward

  • Thrust events are correlated with the range margins, normal faults are correlated with high flat topography

  • This reflects critical taper wedge mechanics coupled with ductile lower crustal flow

  • Publicly available datasets allow examination of large scale problems in the Earth Sciences


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