No Warning, Advisory or Watch is in effect for Puerto Rico and the Virgin Islands.
No Warning, Advisory or Watch is in effect for Puerto Rico and the Virgin Islands.
In the Puerto Rico Seismic Network (PRSN), digital and analog records (seismograms) are processed. The first step, before starting the processing of the seismic data, is to identify in the records all the seismic events that occur daily. Once the earthcuakes are identified, the following step is to determine if the earthquake is LOCAL, REGIONAL (MIDAS) or TELESISMIC. Once determined the type of earthquake we proceed to locate it, all those earthquakes that the PRSN registers, processes and locates are local or regional earthquakes nearby. To process the earthquakes a program developed in the PRSN is used and that uses the program of localization HYPO 2000 as well. This processing program is PRSN Data Analisys and Information System, better known as PRDANIS. The magnitudes of the seismic events are calculated using the maximum amplitude (XMAG) and the duration time or CODA (FMAG) registered by each station, according to Eaton's formula (1994), and using the velocity model proposed by Orphan and Bataille (1994). On the other hand, all earthquakes that PRSN records but cannot locate are processed using the location of the National Earthquake Information Center of the United States Geological Survey (NEIC-USGS) as a basis. These are usually faraway regional earthquakes or faraway earthquakes also known as teleshocks.
All earthquakes located within latitudes 17.0° N - 20.0° N and longitudes 63.5° W - 69.0° W are considered local earthquakes. To determine the location of the seismic event, the arrival times of the P and S waves, the polarity of the waves, as well as the quality of these readings are required. To calculate the magnitude it is necessary to read the duration (CODA) and the maximum amplitude of the seismic wave for each station that recorded the event.
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH RMS ERH ERZ XMAG FMAG PMAG INT
2004-08-22 0009 19.79 18 42.77 68 25.69 179.95 0.24 5.75 2.16 3.84 3.60 3.60D
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
15 19 141.6 PR1 347 12 8 18 11 19 Q PPG 5.00 0.07 7.00 0.02 D
XMAG2-N.XMG2-XMMAD-T-S FMAG2-N.FMG2-FMMAD-T-S PREF.MAG-N.PMAG-PRMAD-T
3.84 5.00 0.07 L 3.60 7.00 0.02 Z 3.60 7.00 0.02 D
REGION= Eastern Dominican Republic
STA NET COM CR DIST AZM AN P/S WT SEC (TOBS -TCAL -DLY =RES) WT SR INFO CAL DUR-W-FMAG-T -AMP-U-PER-W-XMAG-T
AGPR PR HHE A141.6 100 140 ES 1 73.04 53.25 53.26 0.00 -0.01 1.06S 0.519
AGPR PR HHZ A141.6 100 140 EP+ 1 49.87 30.08 29.92 0.00 0.16 1.06 0.265 0.73 72 3.60 Z
LSP PR SHE A153.8 112 138 ES 1 74.81 55.02 55.04 0.00 -0.02 1.06S 0.365
LSP PR SHZ A153.8 112 138 EP+ 1 49.87 30.08 30.92 0.00 -0.84* 0.48 0.055 1.40 95 3.58 Z 62C1.00 4.04 L
LRS PR SHZ A173.6 105 134 EP+ 1 52.35 32.56 32.64 0.00 -0.08 1.06 0.184 1.40 87 3.52 Z 43C1.00 3.94 L
ES 1 78.00 58.21 58.10 0.00 0.11 1.06S 0.149
AOPR PR HHN A181.4 102 133 ES 1 79.07 59.28 59.35 0.00 -0.07 1.06S 0.177
AOPR PR HHZ A181.4 102 133 EP+ 1 53.24 33.45 33.34 0.00 0.11 1.06 0.185 0.73 72 3.64 Z 133C1.00 3.84 L
PORP PR SHZ A202.6 110 130 EP+ 1 54.31 34.52 35.34 0.00 -0.82* 0.58 0.077 1.40 82 3.50 Z
ES 1 82.60 62.81 62.91 0.00 -0.10 1.06S 0.251
CELP PR SHZ A207.8 109 129 EP+ 1 55.73 35.94 35.84 0.00 0.10 1.06 0.242 1.40 91 3.60 Z 23C1.00 3.78 L
ES 1 83.65 63.86 63.80 0.00 0.06 1.06S 0.207
CSB PR SHZ A244.4 100 125 ES 1 89.98 70.19 70.35 0.00 -0.16 1.06S 0.204
SJG IU BHN A249.8 105 124 ES 1 90.88 71.09 71.34 0.00 -0.25 1.06S 0.159
SJG PR SHZ A249.8 105 124 EP+ 1 61.50 41.71 40.09 0.00 1.62* 0.00 0.000 1.40 87 3.61 Z 17C1.00 3.77 L
ES 1 91.73 71.94 71.36 0.00 0.58* 1.06S 0.159
CBYP PR HGZ A276.0 99 121 EP+ 1 62.71 42.92 42.86 0.00 0.06 1.06 0.267 0.73 89
CBYP PR HGN A276.0 99 121 ES 1 96.06 76.27 76.29 0.00 -0.02 1.06S 0.304
HUMP PR HGN A279.8 102 121 ES 1 96.52 76.73 77.02 0.00 -0.29 1.06S 0.222
For events that were not digitally recorded, the P and S arrival times, as well as the CODA and amplitude, are read directly from the seismograms. After these data have been pre-located, the residual errors of each reading, the rms and the vertical (erz) and horizontal (erh) errors are checked. If necessary, the seismogram is reread and the event is relocated. This process is repeated until the best possible location is reached. Once all these steps have been completed, the processing of the seismic is finished, and its location is integrated to our seismic data base, which can be accessed through this page. Our data is used to complement the seismic databases of other networks and is sent to the service lists. The seismic data processed by RSPR is used for research by local and international institutions.
Those earthquakes whose epicenters are located outside the local area, known as the Puerto Rico and Virgin Islands Region, (latitudes 17.0° N - 20.0° N and longitudes 63.5° W - 69.0° W) and within latitudes 5.0° S - 35.0° N and longitudes 55.0° W - 125.0° W are considered regional earthquakes (MIDAS region).
There are three different processes for regional events:
YEAR MO DA --ORIGIN-- --LAT N- --LON W-- DEPTH RMS ERH ERZ XMAG FMAG PMAG INT
2004-08-23 1435 34.77 20 22.89 70 35.70 25.00 0.82 21.33 69.06 4.80 4.41 4.41D
SOURCE
NSTA NPHS DMIN MODEL GAP ITR NFM NWR NWS NVR REMRKS-AVH N.XMG-XMMAD-T N.FMG-FMMAD-T L F X
20 23 396.2 PR1 351 17 11 21 11 23 Q- PPG 6.00 0.10 8.00 0.13 D
XMAG2-N.XMG2-XMMAD-T-S FMAG2-N.FMG2-FMMAD-T-S PREF.MAG-N.PMAG-PRMAD-T
4.82 5.00 0.09 L 4.41 8.00 0.13 Z 4.41 8.00 0.13 D
REGION= Out of Puerto Rico/Virgin Islands
STA NET COM CR DIST AZM AN P/S WT SEC (TOBS -TCAL -DLY =RES) WT SR INFO CAL DUR-W-FMAG-T -AMP-U-PER-W-XMAG-T
IDE PR SHZ A396.2 123 90 EP+ 1 86.40 51.63 52.22 0.00 -0.59* 1.00 0.247 1.40 182 4.16 Z 127C1.00 4.93 L
IDE PR SHE A396.2 123 90 ES 1 131.49 96.72 92.95 0.00 3.77* 0.00S 0.102
AGPR PR HHZ A423.0 119 90 EP+ 1 96.67 61.90 55.61 0.00 6.29* 0.00 0.000 0.73 163 4.39 Z
AGPR PR HHE A423.0 119 90 ES 1 134.95100.18 98.99 0.00 1.19* 1.00S 0.166
LSP PR SHZ A442.6 122 90 EP+ 1 93.60 58.83 58.09 0.00 0.74* 1.00 0.373 1.40 188 4.27 Z
LSP PR SHE A442.6 122 90 ES 1 137.09102.32103.40 0.00 -1.08* 1.00S 0.867
LRS PR SHZ A457.2 119 90 EP+ 1 94.76 59.99 59.95 0.00 0.04 1.00 0.109 1.40 188 4.29 Z
ES 1 140.71105.94106.71 0.00 -0.77* 1.00S 0.166
AOPR PR HHZ A462.4 118 90 EP+ 1 96.43 61.66 60.61 0.00 1.05* 1.00 0.102 0.73 175 4.52 Z 252C1.00 4.77 L
AOPR PR HHE A462.4 118 90 ES 1 144.26109.49107.89 0.00 1.60* 1.00S 0.120
CSB PR SHZ A521.0 115 90 EP+ 1 102.35 67.58 68.02 0.00 -0.44 1.00 0.131 1.40 192 4.42 Z 113C1.00 5.18 L
ES 1 156.69121.92121.08 0.00 0.84* 1.00S 0.136
SJG IU BHE A531.0 117 90 ES 1 156.65121.88123.34 0.00 -1.46* 1.00S 0.099
SJG PR SHZ A531.1 117 90 EP+ 1 104.46 69.69 69.30 0.00 0.39 1.00 0.103 1.40 48C1.00 4.82 L
ES 1 157.92123.15123.35 0.00 -0.20 1.00S 0.099
CBYP PR HGZ A550.5 114 90 EP+ 1 106.08 71.31 71.75 0.00 -0.44 1.00 0.157 0.73 193
CBYP PR HHE A550.5 114 90 ES 1 162.92128.15127.71 0.00 0.43 1.00S 0.193 0.73 148C1.00 4.73 L
CPD PR BHZ A556.9 117 90 EP+ 1 107.20 72.43 72.56 0.00 -0.13 1.00 0.103 0.73 204 4.82 Z
CPD PR BHE A556.9 117 90 ES 1 163.51128.74129.16 0.00 -0.42 1.00S 0.099
HUMP PR HGZ A557.7 115 90 EP- 1 107.23 72.46 72.66 0.00 -0.20 1.00 0.131 0.73 213
HUMP PR HGE A557.7 115 90 ES 1 162.82128.05129.33 0.00 -1.28* 1.00S 0.136 0.73 173C1.00 3.52
MTP PR BHZ A588.0 114 90 EP+ 1 110.79 76.02 76.50 0.00 -0.48 1.00 0.157 0.73 291 5.20 Z
MTP PR BHE A588.0 114 90 ES 1 171.80137.03136.17 0.00 0.86* 1.00S 0.193
SOURCE: NEIC
DATE (yyyy/mm/dd): 2004/08/22
TIME (hh:mm:ss.ss): 04:54:08.90
LATITUDE: 9.351
LONGITUDE: -78.513
DEPTH: 75.3
REGION: Panamá
Mw: 0.0
Mb: 4.6
Ms: 0.0
Ml: 0.0
QUAKE STATIONS: 109
RSPR PHASES: 4
For the Telesismatic earthquakes (outside the latitudes 5.0° S - 35.0° N and the longitudes 55.0° W - 125.0° W) a record of the waveforms that contain the earthquake, the times of arrival and their location is kept (carried out by the NEIC-USGS or another world-wide network). To complete the processing of the far away earthquakes, the times of the first arrival of the wave, the polarity of these, as well as the quality of these readings are required for each station that has registered the earthquake. These data are integrated into the PRSN database with the NEIC-USGS locations or solutions.
SOURCE: NEIC
DATE (yyyy/mm/dd): 2004/08/07
TIME (hh:mm:ss.ss): 09:30:16.45
LATITUDE: 51.814
LONGITUDE: -66.464
DEPTH: 10.0
REGION: South of the Aleutian Island
Mw: 6.0
Mb: 6.3
Ms: 5.4
Ml: 0.0
QUAKE STATIONS: 180
RSPR PHASES: 13