Hope for Complete & Accurate Earthquake Data

- November 25, 2004 -

Unable to cite many earthquake data from the USGS [1], did I investigate into how much percent data the USGS lost. I compared the data of the Central Weather Bureau of Taiwan [2] in the time: 20040101~0803, latitude: 21.8~25 N, longitude: 120~125E, and magnitude: >= 4 with those of the USGS in the same time and area, but all magnitudes, and found that the USGS had lost data of 32.6%. I also did the same work between the data of Bogazici University, Turkey [3] in the time: 20030101~20030630, latitude: 33.9~42.2N, longitude: 24.7~44.4E, and magnitude: >= 4, and those of the USGS, and found a loss ratio of 24.2% for the USGS. Both the Central Weather Bureau of Taiwan and Bogazici University also have a loss ratio over 21% and 31.5% respectively. The details are in the tables [4-5] Like data error [6-7], data loss is a big problem for serious study. For example, my prediction No. 29 to the USGS in Table 5 [8] would be a miss if neither the Northern California Earthquake Data Center [9], nor the Univ. of Nevada [10] had offered the data. The USGS has been playing an important role to offer the data, but the data are not complete, and have large error sometimes. For example, the magnitude of the Sea of Okhotsk earthquake on Nov. 7, 2004 jumped from 5.6 [11] to 6.2 [12]. I hope the USGS and other data producers to peer on those problems for complete and accurate data that are important for earthquake prediction.

References

http://wwwneic.cr.usgs.gov/neis/data_services/ftp_files.html Ftp Catalog of the US Geological Survey (USGS)* http://www.cwb.gov.tw/V4e/index.htm The Central Weather Bureau of Taiwan (Weather & Earthquake) ftp://ftp.koeri.boun.edu.tr/pub/seismo/ Bogazici University, Turkey Table 1 Data Loss of the USGS in Taiwan Region from 20040101 to 0803 Table 2 Data Loss of the USGS in Turkey from 20030101 to 0630 Essay: A010515 Earthquake Database Problems Essay: A020811 Problems of the World Earthquake Database of the U S Geological Survey Zhonghao Shou & Darrell Harrington. Bam Earthquake Prediction & Space Technology UN/Islamic Republic of Iran Regional Workshop on the Use of Space Technology for Environmental Security, Disaster Rehabilitation and Sustainable Development presented by Iranian Scientist Amoli Tehran, Iran. May 9, 2004 http://quake.geo.berkeley.edu/ncedc/catalog-search.html Northern California Earthquake Catalog Search http://quake.seismo.unr.edu/ftp/pub/catalog/ Earthquake Data Catalog of Univ. of Nevada Map 20041107 5.6M by the USGS before Map 20041107 6.2M by the USGS after

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