|
Accession number;00A0320344
|
| Title;An Automated Method for Rapid Determination of CMT Solutions and Source Time Functions of Earthquakes and Evaluation of the Results. |
| Author;
HORI SADAKI
(National Res. Inst. Earth Sci. and Disaster Prevention)
HORIUCHI SHIGEKI
(National Res. Inst. Earth Sci. and Disaster Prevention)
ISHIDA MIZUHO
(National Res. Inst. Earth Sci. and Disaster Prevention)
OI MASAHIRO
(Japan At. Energy Res. Inst., Tokai Res. Establ.)
|
Journal Title;Journal of the Seismological Society of Japan. Second Series
|
Journal Code:G0931A
|
ISSN:0037-1114
|
|
VOL.52;NO.3;PAGE.395-405(1999)
|
| Figure&Table&Reference;FIG.10, TBL.2, REF.26 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Recent advances in broadband seismic observation enable us to analyze high quality waveform data just after the earthquake occurrence. An automated system for rapid determination of earthquake mechanisms for local events occurring beneath central Japan is developed with this point as background. When an earthquake occurs, its hypocentral parameters are determined automatically in several tens of seconds. In a case when an event occurring in a given area has a magnitude larger than a certain value, its source process is automatically analyzed by the use of a broadband waveform inversion technique. Considering the importance to shorten the computer process time to obtain the result, we calculate the Green's functions immediately after hypocentral parameters are calculated and when waveform data to be used in the inversion are being retrieved. The data of the Earth's response parameters, which are used in the calculation of the Green's functions, are stored on the hard disk so as to reduce the total lapse time. As a result, the CMT solution and source time function can be obtained in a few minutes after the earthquake occurrence. Inadequacy of theoretical waveform calculated by the 1-D Earth's model is corrected by introduction of station corrections to the observed arrival time and overparameterization to the source time function, where a number of double couple small sub-events are located in a certain time range. The CMT solution is represented by superimpose of moment tensors of small sub-events with very short duration. All the sub-events are assumed to occur at the same location (i.e., at the hypocenter) but to have different onset times. The source time function is also estimated from the temporal distribution of the sub-events.... (author abst.) |
|
|
|
Related Articles;
|
