摘要
IllustrationAll the data in this catalog are chosen from the 2Preliminary Seismological Report of Chine-se Seismic Stations2 (Its abbreviation is 2Monthly Report2). The catalog includes the events of M34.7 in and near China and M36 all over the world. The 2Monthly Report2 is monthly compiled by the Ninth Section of Institute of Geophysics, CSB.The origin times of earthquakes in the catalog adopt coordinated universal time (UTC) in accordance with international convention. The location of every epicenter is expressed by its latitude and longitude, at the same time by the corresponding geographical region proposed by Flinn and Engdahl. The regional names are only for references and do not imply any political significance. The number of stations used and standard deviation are also given in order to illus-trate the precision of location.The surface wave magnitude MS is measured from the records of intermediate period broad band SK seismographs and adopting the surface wave magnitude formula of Beijing Station of 1965: MS= lg(AH/T)+1.66lgD +3.5 (1°<D<130°), in which AH is the resultant displacement ampli-tude of the maximum surface wave of horizontal components. MS7 is measured from records of the long-period seismographs of 763 type and adopting the surface wave magnitude formula re-commended by IASPEI in 1967. MS7=lg(AV/T)+1.66lgD +3.3 (20°<D<160°), in which AV is the maximum ground displacement of surface wave in vertical component, mb is short-period body-wave magnitude. ML is local magnitude. In order to avoid confusion, no conversion is made among the various magnitudes. For convenience of use and comparison, the surface wave mag-nitude MSZ (NEIS) and mb (NEIS) measured by NEIS recorded on short period seismographs are also listed.
