| 1 | World Earthquake Epicenters |
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| 2 | 1 January 1990 through 31 December 2006 |
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| 3 | |
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| 4 | |
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| 5 | ------------------ |
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| 6 | 1. Source of data: |
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| 7 | ------------------ |
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| 8 | The original earthquake data was downloaded from the National |
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| 9 | Earthquake Information Center at, |
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| 10 | |
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| 11 | http://wwwneic.cr.usgs.gov/neis/epic/epic_global.html |
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| 12 | |
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| 13 | |
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| 14 | ------------------------------- |
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| 15 | 2. Contents of Earthquakes.zip: |
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| 16 | ------------------------------- |
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| 17 | The ASCII .PRN files in Earthquakes.zip contain the positions of |
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| 18 | all earthquakes with magnitudes >= 5.0 on the Richter scale, that |
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| 19 | occurred from 1 January 1990 through 31 December 2006. There are |
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| 20 | a total of 26,222 earthquakes. The .PRN files can be plotted |
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| 21 | directly from Versamap version 3. |
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| 22 | |
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| 23 | ---------- --------- |
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| 24 | File Contents |
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| 25 | ---------- --------- |
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| 26 | ReadMe_Earthquakes.txt This file |
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| 27 | EQ_ALL.PRN All 26,222 earthquakes |
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| 28 | EQ_M5.PRN All magnitude 5 earthquakes, 23546 |
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| 29 | EQ_M6.PRN All magnitude 6 earthquakes, 2371 |
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| 30 | EQ_M7.PRN All magnitude 7 earthquakes, 283 |
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| 31 | EQ_M8.PRN All magnitude 8 earthquakes, 21 |
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| 32 | EQ_M9.PRN All magnitude 9 earthquakes, 1 |
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| 33 | |
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| 34 | The single magnitude 9 earthquake in EQ_M9.PRN is the earthquake |
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| 35 | that caused the Tsunami of 26 December 2004 in the Indian Ocean. |
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| 36 | |
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| 37 | |
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| 38 | --------------------------------------------- |
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| 39 | 3. How to plot these earthquakes in Versamap: |
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| 40 | --------------------------------------------- |
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| 41 | To plot the earthquakes in EQ_ALL.PRN, |
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| 42 | |
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| 43 | a. Open the Contents tab of the Versamap Help file. |
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| 44 | b. Select 'How to plot an ASCII PRN or UTM file' under 'How |
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| 45 | to...' in Contents. |
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| 46 | c. Substitute the filename EQ_ALL.PRN for VmapUser.prn, and |
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| 47 | follow the instructions on how to plot VmapUser.prn. |
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| 48 | d. Stop displaying the earthquake magnitude labels, which plot |
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| 49 | next to each point, by following the instructions under |
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| 50 | 'Stop displaying city names in VmapUser.prn' at the end of |
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| 51 | the help topic. |
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| 52 | |
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| 53 | |
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| 54 | ----------------------------- |
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| 55 | 4. File format of .PRN files: |
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| 56 | ----------------------------- |
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| 57 | Each line, in the above .PRN files, represents 1 earthquake. All |
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| 58 | lines have the same format. The following is the first line of |
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| 59 | data in EQ_M5.PRN, |
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| 60 | |
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| 61 | -1 -21.77 -179.36 "" "5.20" "1990 01 01" "074935.57" |
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| 62 | |
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| 63 | ----- -------- |
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| 64 | Field Contents |
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| 65 | ----- -------- |
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| 66 | -1 Line header, same for all records. |
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| 67 | -21.77 Decimal latitude, south latitude is negative. |
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| 68 | -179.36 Decimal longitude, west longitude is negative. |
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| 69 | "" Null string to prevent following comments from |
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| 70 | displaying in Versamap. |
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| 71 | "5.20" Earthquake magnitude. |
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| 72 | "1990 01 01" Year, Month, Day. |
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| 73 | "074935.57" Origin Time in Coordinated Universal Time (UTC). |
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| 74 | |
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| 75 | |
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| 76 | The data in quotes to the right of the longitude, |
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| 77 | |
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| 78 | "" "5.20" "1990 01 01" "074935.57" |
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| 79 | |
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| 80 | are comments. |
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| 81 | |
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| 82 | The format of Versamap ASCII .PRN files is discussed in the |
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| 83 | Versamap Help file. Search for 'file format', and select the |
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| 84 | topic 'File format for PRN files'. |
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