Accessible Resources

Backprojection Results
Seismic Tomography Models
Processed Data
Historical Recordings and Digitization
Miscellaneous


Backprojection Results

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


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.

Processed Data

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

Historical Seismograms and Digitization

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.

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 193419351936193719381939
1940's 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
1950's 1950 1951 1952 1953

DigitSeis is a new open-source, interactive digitization software written in MATLAB that converts digital, raster images of analog seismograms to readily usable, discretized time series using image processing algorithms. The downloadable file below is in zip, containing required codes.
Miscellaneous
Department of Earth and Planetary Sciences / Harvard University / 20 Oxford Street / Cambridge / MA 02138 / U.S.A. / Telephone: +1 617 495 2350 / Fax: +1 617 496 1907 / Email: reilly@eps.hartvard.edu