Produced by Marilynda Fraser-Cunliffe, Jeannie Howse, David Garcia and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was made using scans of public domain works from the University of Michigan Digital Libraries) * * * * * +--------------------------------------------------------------+ | Transcriber's Note: | | | | Most of the information in this document is presented in | | wide tables (75 characters per line). | | | | A number of obvious typographical errors have been corrected | | in this text. For a complete list, please see the bottom of | | this document. | | | +--------------------------------------------------------------+ * * * * * DEPARTMENT OF THE INTERIOR WEATHER BUREAU MANILA CENTRAL OBSERVATORY CATALOGUE OF VIOLENT AND DESTRUCTIVE EARTHQUAKES IN THE PHILIPPINES WITH AN APPENDIX EARTHQUAKES IN THE MARIANAS ISLANDS 1599-1909 BY REV. MIGUEL SADERRA MASO, S. J. ASSISTANT DIRECTOR OF THE WEATHER BUREAU MANILA BUREAU OF PRINTING 1910 CATALOGUE OF VIOLENT AND DESTRUCTIVE EARTHQUAKES IN THE PHILIPPINES (1599-1909). Introduction.--The occasion for publishing this catalogue of Philippine earthquakes which were of violent and destructive character has been furnished by a request from Prof. John Milne for a list of such phenomena, to be included in the General Earthquake Catalogue which this eminent seismologist is preparing under the auspices of the British Association for the Advancement of Science. The said general catalogue has been undertaken with a view toward reducing to uniformity and completing those published years ago by Robert Mallet (1859) and Perrey (1844-1871). The form adopted for Professor Milne's new catalogue is very concise, comprising only the date, intensity, and region together with principal localities affected. It will contain only the earthquakes of intensities VII to X according to the scale of De Rossi-Forel, and these will be divided into three classes: Class I will be formed by the earthquakes of sufficient force to produce cracks in buildings and to throw down chimneys; they correspond to force VII of De Rossi-Forel. Class II consists of the earthquakes which not only threw down chimneys but also walls and some weak structures; force VIII of De Rossi-Forel. Class III comprises the earthquakes which caused general destruction; force IX and X of De Rossi-Forel. As this classification is as purely conventional as every other and adopted only in the catalogue mentioned, we do not employ it in the present catalogue of Philippine earthquakes, but retain the