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Open Source Visualization of GPS Displacements for Earthquake Cycle Physics

jueves, 10 de noviembre de 2016

Posted by Jimbo Wilson, Software Engineer, Google Big Picture Team and Brendan Meade, Professor, Harvard Department of Earth and Planetary SciencesEarth’s surface is movingGlobal Navigation Satellite Systemstrain energyApache 2 licenseavailable on GitHubDepartment of Earth and Planetary SciencesMachine PerceptionBig Picture

Examples of classical approaches. On the left is a map view showing average velocity vectors over the period from 1997 to 2001[1]. On the right you can see a time versus eastward (longitudinal) position plot for a single station.

Day Index

Longitude

Latitude

0

139.06990407

34.949757897

1

139.06990400

34.949757882

2

139.06990413

34.949757941

3

139.06990409

34.949757921

4

139.06990413

34.949757904

5.5

Close-up of a single station’s movement during the three year period from 2003 to 2006.

GEONET array in Japan

GPS data sets (in .json format) for both the GEONET data in Japan and the Plate Boundary Observatory (PBO) data in the western US are available at earthquake.rc.fas.harvard.edu.

Modifying the multiplier adjusts how significantly the movements are magnified.

We can adjust the time slider nubs to select a particular time range of interest.

Using the map controls provided by the Google Maps JavaScript API, we can zoom into a tiny region of the map.

By enabling map markers, we can see information about individual GNSS stations.

Station designated 960601 of Japan’s GEONET array is located on the island of Mikura-jima. Here we see the period from 2006 to 2012, with movement magnified 10^5.1 times (126,000x).

THREE.jsearthquake.rc.fas.harvard.eduAcknowledgmentsMachine PerceptionBig Picture TeamReferencesGeodetic imaging of plate motions, slip rates, and partitioning of deformation in JapanJournal of Geophysical Research.