Accessible Resources

Backprojection Results
Seismic Tomography Models
Processed Data
Historical Recordings from HRV Station
Miscellaneous


Backprojection Results

Please keep in mind that the file sizes for some of the high-resolution animations can exceed 30 MB.

• April 11, 2012 Sumatra Earthquakes (Animations)
  • Mw 8.6 Earthquake -- 08:38:37 [Low Res.] [High Res.]
  • Mw 8.2 Earthquake -- 10:43:09 [Low Res.] [High Res.]
• March 11, 2011 Tohoku-Oki, Japan Earthquake
  • Mainshock animation (variable amplitude): [Low Res.] [High Res.]
  • Animation for the first 25 minutes (variable amplitude): [Low Res.] [High Res.]
• February 27, 2010 Maule, Chile Earthquake Animation: [Low Res.] [High Res.]
• March 28, 2005, Sumatran Earthquake
  • Animation: [Low Res.] [High Res.]
  • Numerical table of time-integrated relative high-frequency energy release as a function of position
• December 26, 2004, Sumatra-Andaman Earthquake
  • Animation: [Low Res.] [High Res.]
  • Numerical table of total (time-integrated) relative high-frequency energy release as a function of position

Seismic Tomography Models

During the last three decades, under supervision of Adam Dziewonski, Göran Ekström and Jeroen Tromp, several models of seismic velocity/density perturbations have been released by the Harvard Seismology Group. These models have provided valuable constraints about the Earth's interior. You can access some of these models by following the links below.

• Link to description of each tomographic model
• Links to download pages

Processed Data

While carrying out research, various types of processed data are generated. Some of these data are available.

• Group velocity maps
• Phase velocity maps
• Normal-mode observations

Historical Seismograms from HRV Station

Harvard University, Department of Earth and Planetary Sciences maintains the HRV station located at the Adam Dziewonski Observatory (Oak Ridge, MA). The station is deployed in 1933, and is one of the oldest seismograph stations in the USA. The recordings of this station after 1972 are accessible online through IRIS. However, the earlier seismograms were not digitized or cataloged in a systematic manner. Starting around mid 2012, significant amount of resources are devoted to clean and digitize the old seismograms from the HRV station.

Click on the year below to see image holdings. As we make progress, more images will be added. Please check the Status page for the latest status of the project.

1930's				1933	1934	1935	1936	1937	1938	1939
1940's	1940	1941	1942	1943	1944	1945	1946	1947	1948	1949
1950's	1950	1951	1952	1953

Miscellaneous

• Eric Kiser's Public PhD Defense (April 27, 2012)
• Geophysics at Harvard (published in 1939 or 1940)
• EPS166 class visits the HRV station (October 2nd, 2012). We owe special thanks to Dr. Joseph Steim for his through presentation about principles of recording ground motion, and deploying/operating a global station.