The event occured near the town of Aplao, Peru (16.07S, 72.5W) on February 2, 2004 at about 12.30 local time (17.30 UTC=Z).
First, please look at the position of area on the maps below:
Meteorological data from the Arequipa meteo-station (16.3S, 71.6W), which is about
110 km to the east-south-east of the place of the event shows the following
(from
An upsurge of cloudiness right after the event is well-seen.
Meteorological satellite pictures shows more cloudiness's features.
More detailed GOES-12 satellite pictures of the area from
14S to 18S and from 75W to 70W (i.e. the place of the event is right in the
center of the images) are shown below (taken from
The National Oceanic and Atmospheric Administration (NOAA)
Satellite Active Archive (SAA)
www.saa.noaa.gov). Times
of the images are taken as averaged between time of the beginning and the
ending of scanning (on the original GOES-12 images times of the beginning
of the scanning are given).
The images demonstrate fast development of the cloudiness cover in the
area of the event. The resulting cloud cover was rather thick - this is
clearly seen on the
false-color GOES-12 image
taken at appr. 19.52Z (time's mark on the image points to beginning of
the scanning). The image was taken from www.met.igp.gob.pe .
Regarding the tectonic aspect, there is no question about tectonic activity
in the region. Below is a map of earthquakes generated by
International Seismological Centre, On-line Bulletin,
(http://www.isc.ac.uk/Bull, Internatl. Seis. Cent., Thatcham,
United Kingdom, 2001). The earthquakes shown are for 1990s for the region
from 75W to 70W and from 14S to 18S.
What else? A geomagnetic activity was relatively low. Nevertheless the Huancayo
observatory registered a geomagnetic disturbance at those times, but
the disturbance commenced some hours before the event, and something similar
was registered by other geomagnetic observatories (and Kp index is moderately
elevated). So it is rather
unlikely, that it is associated with the event (or, at least, it was not
caused by the event).
Time(PET) Temperature Dew Point Humidity Pressure Visibility Wind Direction Wind Speed Gust Speed Precipitation Events Conditions
12:00 AM
12.0 °C
8.0 °C
77%
1027 hPa
-
NNE
7.4 km/h
-
N/A
Scattered Clouds
METAR SPQU 020500Z 02004KT 9999 FEW040 SCT100 12/08 Q1027 RMK PP000
1:00 AM
11.0 °C
6.0 °C
71%
1026 hPa
-
Calm
Calm
-
N/A
Mostly Cloudy
METAR SPQU 020600Z 00000KT 9999 BKN040 11/06 Q1026 RMK PP000
2:00 AM
11.0 °C
6.0 °C
71%
1026 hPa
-
Calm
Calm
-
N/A
Mostly Cloudy
METAR SPQU 020700Z 00000KT 9999 BKN040 11/06 Q1026 RMK PP000
3:00 AM
11.0 °C
5.0 °C
67%
1026 hPa
-
Calm
Calm
-
N/A
Scattered Clouds
METAR SPQU 020800Z 00000KT 9999 SCT040 11/05 Q1026 RMK PP000
4:00 AM
10.0 °C
5.0 °C
71%
1026 hPa
-
Calm
Calm
-
N/A
Scattered Clouds
METAR SPQU 020900Z 00000KT 9999 SCT040 10/05 Q1026 RMK PP000
5:00 AM
10.0 °C
4.0 °C
66%
1026 hPa
-
Calm
Calm
-
N/A
Scattered Clouds
METAR SPQU 021000Z 00000KT 9999 SCT040 10/04 Q1026 RMK PP000
6:00 AM
10.0 °C
4.0 °C
66%
1026 hPa
-
Calm
Calm
-
N/A
Scattered Clouds
METAR SPQU 021100Z 00000KT 9999 SCT040 10/04 Q1026 RMK PP000
7:00 AM
15.0 °C
9.0 °C
67%
1026 hPa
-
5.6 km/h
-
N/A
Clear
METAR SPQU 021200Z VRB03KT CAVOK 15/09 Q1026 NOSIG RMK PP000
8:00 AM
17.0 °C
10.0 °C
63%
1026 hPa
-
South
7.4 km/h
-
N/A
Clear
METAR SPQU 021300Z 18004KT CAVOK 17/10 Q1026 NOSIG RMK PP000
9:00 AM
19.0 °C
10.0 °C
56%
1026 hPa
-
SSW
9.3 km/h
-
N/A
Clear
METAR SPQU 021400Z 21005KT CAVOK 19/10 Q1026 NOSIG RMK PP000
10:00 AM
19.0 °C
10.0 °C
56%
1026 hPa
-
WSW
13.0 km/h
-
N/A
Clear
METAR SPQU 021500Z 24007KT CAVOK 19/10 Q1026 NOSIG RMK PP000
11:00 AM
21.0 °C
10.0 °C
49%
1026 hPa
-
WSW
14.8 km/h
-
N/A
Clear
METAR SPQU 021600Z 25008KT CAVOK 21/10 Q1026 NOSIG RMK PP000
12:00 PM
21.0 °C
11.0 °C
53%
1025 hPa
-
WSW
16.7 km/h
-
N/A
Clear
METAR SPQU 021700Z 24009KT CAVOK 21/11 Q1025 NOSIG RMK PP000
1:00 PM
22.0 °C
9.0 °C
43%
1025 hPa
-
WSW
16.7 km/h
-
N/A
Partly Cloudy
METAR SPQU 021800Z 25009KT 9999 FEW080 22/09 Q1025 NOSIG RMK PP000
2:00 PM
21.0 °C
11.0 °C
53%
1025 hPa
-
West
16.7 km/h
-
N/A
Scattered Clouds
METAR SPQU 021900Z 26009KT 9999 SCT025 SCT100 21/11 Q1025 NOSIG RMK PP000
3:00 PM
19.0 °C
10.0 °C
56%
1024 hPa
-
West
20.4 km/h
-
N/A
Scattered Clouds
METAR SPQU 022000Z 28011KT 9999 SCT025 SCT100 19/10 Q1024 NOSIG RMK PP000
4:00 PM
16.0 °C
11.0 °C
72%
1024 hPa
-
West
22.2 km/h
-
N/A
Mostly Cloudy
METAR SPQU 022100Z 28012KT 8000 SCT017 BKN050 16/11 Q1024 TEMPO 5000 BR RMK PP000
4:38 PM
14.0 °C
11.0 °C
82%
1025 hPa
-
West
20.4 km/h
-
N/A
Light Drizzle
SPECI SPQU 022138Z 27011KT 5000 -DZBR SCT010 BKN030 14/11 Q1025
5:00 PM
14.0 °C
12.0 °C
88%
-
-
West
18.5 km/h
-
N/A
Mist
METAR SPQU 022200Z 26010KT 1000 BR SCT006 BKN020 14/12 Q1025 NOSIG PPTZS TMAX 22 4
5:05 PM
13.0 °C
12.0 °C
94%
1025 hPa
-
West
16.7 km/h
-
N/A
Fog
Fog
SPECI SPQU 022205Z 26009KT 0500 FG VV005 13/12 Q1025
6:00 PM
13.0 °C
12.0 °C
94%
1025 hPa
-
WNW
14.8 km/h
-
N/A
N/A
METAR SPQU 022300Z 30008KT 0100 VV002 13/12 Q1025 NOSIG RMK PP000
7:00 PM
13.0 °C
11.0 °C
88%
1025 hPa
-
West
11.1 km/h
-
N/A
Fog
Fog
METAR SPQU 030000Z 27006KT 0300 FG SCT007 BKN010 13/11 Q1025 RMK PP000
8:00 PM
13.0 °C
11.0 °C
88%
1025 hPa
-
3.7 km/h
-
N/A
Fog
Fog
METAR SPQU 030100Z VRB02KT 0300 FG SCT007 BKN010 13/11 Q1025 RMK PP000
9:00 PM
13.0 °C
11.0 °C
88%
1025 hPa
-
Calm
Calm
-
N/A
Fog
Fog
METAR SPQU 030200Z 00000KT 0800 FG SCT010 BKN012 13/11 Q1025 RMK PP000
9:35 PM
12.0 °C
10.0 °C
88%
-
-
Calm
Calm
-
N/A
Mist
SPECI SPQU 030235Z 00000KT 3000 BR SCT017 BKN030 12/10 Q1026 VIS CDTE W 1200M BANCO NIEBLA CDTE W VRBL
10:00 PM
12.0 °C
10.0 °C
88%
-
-
3.7 km/h
-
N/A
Mist
METAR SPQU 030300Z VRB02KT 3000 BR SCT026 BKN070 12/10 Q1028 VIS CDTE W 1500M VRBL RMK PP000
10:30 PM
13.0 °C
11.0 °C
88%
1027 hPa
-
5.6 km/h
-
N/A
Scattered Clouds
SPECI SPQU 030330Z VRB03KT 8000 SCT030 SCT100 13/11 Q1027
11:00 PM
13.0 °C
11.0 °C
88%
1026 hPa
-
5.6 km/h
-
N/A
Scattered Clouds
METAR SPQU 030400Z VRB03KT 9999 FEW030 SCT150 13/11 Q1026 RMK PP000
Here are GOES-12 infrared band 4 images for the region taken at
15.00 Z,
18.00 Z,
21.00 Z,
15.00 Z (look at the
associated image in the visible
spectrum);
15.22 Z (look at the
associated image in the visible
spectrum);
15.52 Z (look at the
associated image in the visible
spectrum);
16.22 Z (look at the
associated image in the visible
spectrum);
16.52 Z (look at the
associated image in the visible
spectrum);
17.22 Z (look at the
associated image in the visible
spectrum);
18.00 Z (look at the
associated image in the visible
spectrum);
18.22 Z (look at the
associated image in the visible
spectrum);
18.52 Z (look at the
associated image in the visible
spectrum);
19.22 Z (look at the
associated image in the visible
spectrum);
19.52 Z (look at the
associated image in the visible
spectrum);
20.22 Z (look at the
associated image in the visible
spectrum);
21.00 Z (look at the
associated image in the visible
spectrum);
Kp indexes ( from http://sec.noaa.gov/ftpdir/lists/geomag/200402AK.txt ) for February 2, 2004 are below
Beijing N29 W174 -1 -1 -1 -1 -1 -1 -1 -1 -1
Belsk N69 E 40 16 2 2 3 4 3 4 3 4
Boulder N49 W 42 28 2 2 6 5 4 4 3 3
Cape Chelyuskin N66 E177 404 5 2 4 4 6 6 4 4
Chambon-la-foret N-- E--- -1 -1 -1 -1 -1 -1 -1 -1 -1
College N65 W102 34 1 1 4 6 6 5 3 3
Dixon Island N63 E162 298 4 2 4 5 6 6 5 6
Fredericksburg N49 W 8 28 2 2 6 5 4 4 3 3
Gottingen(provisional Ap) -1 -1 -1 -1 -1 -1 -1 -1 -1
Kergulen Island S57 E130 -1 -1 -1 -1 -1 -1 -1 -1 -1
Krenkel N71 E156 -1 -1 -1 -1 -1 -1 -1 -1 -1
Learmonth S33 W175 -1 -1 -1 -1 -1 -1 -1 -1 -1
St. Petersburg N56 E118 12 1 1 2 2 3 5 1 2
Magadan N51 W148 24 2 1 4 5 5 4 3 3
Moscow N51 E122 12 1 1 3 3 2 4 2 3
Murmansk N63 E127 13 2 2 3 3 3 3 3 3
Novosibirsk N45 E159 14 2 0 3 3 4 4 1 3
P. Tunguska N51 E165 19 2 2 4 4 4 4 3 3
Petropavlovsk N45 W140 20 2 1 4 5 4 4 3 2
Planetary(estimated Ap) 21 2 1 5 4 4 4 3 3
Tiksi Bay N61 W168 283 3 2 5 5 6 8 6 5
Wingst N54 E 95 -1 -1 -1 -1 -1 -1 -1 -1 -1
