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World Earthquake Epicenters |
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1 January 1990 through 31 December 2006 |
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1. Source of data: |
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------------------ |
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The original earthquake data was downloaded from the National |
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Earthquake Information Center at, |
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http://wwwneic.cr.usgs.gov/neis/epic/epic_global.html |
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------------------------------- |
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2. Contents of Earthquakes.zip: |
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------------------------------- |
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The ASCII .PRN files in Earthquakes.zip contain the positions of |
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all earthquakes with magnitudes >= 5.0 on the Richter scale, that |
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occurred from 1 January 1990 through 31 December 2006. There are |
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a total of 26,222 earthquakes. The .PRN files can be plotted |
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directly from Versamap version 3. |
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|
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---------- --------- |
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File Contents |
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---------- --------- |
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ReadMe_Earthquakes.txt This file |
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EQ_ALL.PRN All 26,222 earthquakes |
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EQ_M5.PRN All magnitude 5 earthquakes, 23546 |
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EQ_M6.PRN All magnitude 6 earthquakes, 2371 |
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EQ_M7.PRN All magnitude 7 earthquakes, 283 |
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EQ_M8.PRN All magnitude 8 earthquakes, 21 |
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EQ_M9.PRN All magnitude 9 earthquakes, 1 |
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The single magnitude 9 earthquake in EQ_M9.PRN is the earthquake |
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that caused the Tsunami of 26 December 2004 in the Indian Ocean. |
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--------------------------------------------- |
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3. How to plot these earthquakes in Versamap: |
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--------------------------------------------- |
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To plot the earthquakes in EQ_ALL.PRN, |
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a. Open the Contents tab of the Versamap Help file. |
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b. Select 'How to plot an ASCII PRN or UTM file' under 'How |
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to...' in Contents. |
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c. Substitute the filename EQ_ALL.PRN for VmapUser.prn, and |
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follow the instructions on how to plot VmapUser.prn. |
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d. Stop displaying the earthquake magnitude labels, which plot |
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next to each point, by following the instructions under |
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'Stop displaying city names in VmapUser.prn' at the end of |
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the help topic. |
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----------------------------- |
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4. File format of .PRN files: |
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----------------------------- |
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Each line, in the above .PRN files, represents 1 earthquake. All |
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lines have the same format. The following is the first line of |
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data in EQ_M5.PRN, |
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-1 -21.77 -179.36 "" "5.20" "1990 01 01" "074935.57" |
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----- -------- |
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Field Contents |
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----- -------- |
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-1 Line header, same for all records. |
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-21.77 Decimal latitude, south latitude is negative. |
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-179.36 Decimal longitude, west longitude is negative. |
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"" Null string to prevent following comments from |
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displaying in Versamap. |
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"5.20" Earthquake magnitude. |
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"1990 01 01" Year, Month, Day. |
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"074935.57" Origin Time in Coordinated Universal Time (UTC). |
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The data in quotes to the right of the longitude, |
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"" "5.20" "1990 01 01" "074935.57" |
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are comments. |
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The format of Versamap ASCII .PRN files is discussed in the |
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Versamap Help file. Search for 'file format', and select the |
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topic 'File format for PRN files'. |
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