The scanned images of the bulletins of the International Seismological
Summary (ISS) have been obtained as part of a global earthquake
relocation project (Villaseñor et al., 1997) initiated with funding from the US
National Science Foundation through grant EAR-9725140 and collected by
SGA Storia Geofisica Ambiente (Bologna) on behalf of the Istituto
Nazionale di Geofisica e Vulcanologia (Rome), in the frame of Euroseismos
project.
A digital hypocenter file of the ISS (Villaseñor and Engdahl, 2005) can be
obtained from the USGS web site: http://earthquake.usgs.gov/scitech/iss/
These data are considered public domain and may be freely distributed or
copied for non-profit purposes provided the previous references are
quoted.
Villaseñor, A., and E.R. Engdahl, A digital hypocenter catalog for the
International Seismological Summary, Seism. Res. Lett., vol. 76, no. 5, pp. 554559, 2005.
Villaseñor, A., E.A. Bergman, T.M. Boyd, E.R. Engdahl, D.W. Frazier, M.M.
Harden, J.L. Orth, R.L. Parkes, and K.M. Shedlock, Toward a comprehensive
catalog of global historical seismicity, Eos Trans. AGU, vol. 78, no. 50, pp. 581,
583, 588, 1997.