El Salvador seismic activity

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HurricaneBill
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Re: El Salvador seismic activity

#61 Postby HurricaneBill » Tue Oct 11, 2011 4:13 am

It's been 25 years since the destructive San Salvador earthquake that struck on October 10, 1986.

Although its magnitude was only M5.7, it occurred at a shallow depth right underneath the city. It also struck close to noon, when the city was active.

1,500 people killed.
10,000 people were injured.
200,000 were left homeless.

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Macrocane
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Re: El Salvador seismic activity

#62 Postby Macrocane » Fri Nov 25, 2011 8:43 am

:uarrow: I hadn't been born yet during that earthquake but surely it was the worst disaster in San Salvador's history and one of the worst for the country, Downtown San Salvador was never the same after that as several buildings were destryed by the erathquake, now most of the important buildings are in other parts pf the city but downtown. One important thing to know is that may buildings and homes were already damaged by a 6.5 magnitude in 1965 and another 7.0 magnitude in 1982 but the lack of a true construction policy at the time was responsible for ignoring the damages in the constructions.
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Re: El Salvador seismic activity

#63 Postby Macrocane » Fri Nov 25, 2011 9:18 am

EARTHQUAKE SWARM IN LA UNION

Another earthquake swarm has developed in La Union near the Gulf of Fonseca, earlier this year was another one near the same location. 12 Earthquakes have been felt since the swarm began on November 20, additionally 2 more earthquakes have occurred in San Salvador and 2 more in the subduction zone offshore. It's important to mention that the quakes in La Union and San Salvador have been felt only in the closest areas to the epicenter, the subduction quakes have been felt in most of the country. A summary of the earthquakes:

Date: November 20 2011
Local Time: 23:18
Location: El Carmen, department of La Union.
Magnitude: 2.9

Date: November 22 2011
Local Time: 22:26
Location: Offshore 40 km south of San Diego.
Magnitude: 3.8

Date: November 23 2011
Local Time: 15:09
Location: 7 km northeast of La Union city.
Magnitude: 2.7

Date: November 23 2011
Local Time: 16:48
Location: Amapalita, department of La Union.
Magnitude: 2.6

Date: November 23 2011
Local Time: 17:23
Location: 5 km west of Conchagua, department of La Union.
Magnitude: 3.7

Date: November 23 2011
Local Time: 17:32
Location: 5 km west of Conchagua, department of La Union.
Magnitude: 2.7

Date: November 23 2011
Local Time: 20:31
Location: Offshore, 35 km south of Las Hojas beach.
Magnitude: 3.6

Date: November 24 2011
Local Time: 15:13
Location: 5 km southeast of El Carmen, department of La Union.
Magnitude: 4.6
Intensity: V in El Carmen.

Date: November 24 2011
Local Time: 15:59
Location: El Carmen, department of La Union.
Magnitude: 3.4
Intensity: III in El Carmen.

Date: November 24 2011
Local Time: 21:26
Location: 5 km east of El Carmen, department of La Union.
Depth: 1.1 km
Magnitude: 3.0
Intensity: II in El Carmen.

Date: November 24 2011
Local Time: 23:38
Location: 5 km east of El Carmen, department of La Union.
Depth: 1.2 km
Magnitude: 3.0
Intensity: II in El Carmen.

Date: November 25 2011
Local Time: 00:41
Location: 7 km southeast of El Carmen, department of La Union.
Depth: 1.9 km
Magnitude: 2.7
Intensity: II in El Carmen.

Date: November 25 2011
Local Time: 01:00
Location: 7 km southeast of El Carmen, department of La Union.
Depth: 5.9 km
Magnitude: 2.7
Intensity: II in El Carmen.

Date: November 25 2011
Local Time: 01:19
Location: 7 km west of Conchagua, department of La Union.
Depth: 4.2 km
Magnitude: 3.7
Intensity: IV in Conchagua.

Date: November 25 2011
Local Time: 02:02
Location: 5 km east of El Carmen, department of La Union.
Depth: 4.2 km
Magnitude: 3.2
Intensity: III in El Carmen.

Date: November 25 2011
Local Time: 03:28
Location: 5 km east of El Carmen, department of La Union.
Depth: 1.1 km
Magnitude: 2.7
Intensity: II in El Carmen.

Date: November 25 2011
Local Time: 03:49
Location: San Salvador.
Depth: 1.3 km
Magnitude: 1.7
Intensity: II in La Escalon neighborhood, San Salvador.

Date: November 25 2011
Local Time: 03:54
Location: San Salvador.
Depth: 1.3 km
Magnitude: 1.9
Intensity: II in La Escalon neighborhood, San Salvador.

Date: November 25 2011
Local Time: 05:32
Location: 5 km east of El Carmen, department of La Union.
Depth: 3.6 km
Magnitude: 2.8
Intensity: II in El Carmen.

This map shows the location of the swarm in La Union:

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Re: El Salvador seismic activity

#64 Postby Macrocane » Fri Nov 25, 2011 10:51 pm

ALMOST 100 HOMES DAMAGED BY EARTHQUAKE SWARM

The government has declared yellow alert in the city of La Union and the village of El Carmen because of the quakes, at least 92 homes have been damaged in the area but no injuries or deaths have been reported. Alerta Amarilla en El Carmen y la Union

3 more quakes have been registered since this morning:

Date: November 24 2011
Local Time: 18:17
Location: 5 km southeast of El Carmen, department of La Union.
Depth: 1.1 km
Magnitude: 2.8
Intensity: II in El Carmen.

Date: November 24 2011
Local Time: 18:32
Location: 5 km east of El Carmen, department of La Union.
Depth: 1.1 km
Magnitude: 2.8
Intensity: II in El Carmen.

Date: November 24 2011
Local Time: 20:14
Location: 7 km southeast of El Carmen, department of La Union.
Depth: 4.2 km
Magnitude: 2.6
Intensity: II in El Carmen.
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Re: El Salvador seismic activity

#65 Postby Macrocane » Sat Nov 26, 2011 1:57 pm

Acccording to the SNET (El Salvador's geological and meteorology agency) informed today that 1000 earthquakes have been registered since the event began but "only" 27 have been felt, 6 of those have been felt today.

Date: November 26 2011
Local Time: 00:10
Location: 10 km east of El Carmen, department of La Union.
Depth: 1.1 km
Magnitude: 3.1
Intensity: II in El Carmen.

Date: November 26 2011
Local Time: 00:29
Location: 7 km southeast of El Carmen, department of La Union.
Depth: 4.5 km
Magnitude: 2.9
Intensity: II in El Carmen.

Date: November 26 2011
Local Time: 01:05
Location: 5 km southeast of El Carmen, department of La Union.
Depth: 1.1 km
Magnitude: 2.9
Intensity: II in El Carmen.

Date: November 26 2011
Local Time: 02:00
Location: 7 km southeast of El Carmen, department of La Union.
Depth: 6.0 km
Magnitude: 2.8
Intensity: II in El Carmen.

Date: November 26 2011
Local Time: 06:14
Location: 5 km southeast of El Carmen, department of La Union.
Depth: 7.0 km
Magnitude: 2.7
Intensity: II in El Carmen.

Date: November 26 2011
Local Time: 00:10
Location: 8 km northeast of El Carmen, department of La Union.
Depth: 6.1 km
Magnitude: 2.7
Intensity: II in El Carmen.
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Re: El Salvador seismic activity

#66 Postby Macrocane » Mon Nov 28, 2011 8:31 am

10 more earthquakes have occured in the las 48 hours in the same area, the magnitudes have been between 2.4 and 2.8, all of them have had an intensity of II in El Carmen, La Union.
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#67 Postby brunota2003 » Wed Nov 30, 2011 9:17 am

Y'all don't have a volcano there, do you? Those depths are very shallow...and easily match the depths looked for when considering moving magma...and they are all in the same general area.
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Re: El Salvador seismic activity

#68 Postby HurricaneBill » Wed Nov 30, 2011 10:54 pm

Image

The most recent eruptions were from San Miguel (2002) and Santa Ana (2005).

San Miguel and Conchagua (no confirmed historical eruptions) are near the swarm location.
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Re: El Salvador seismic activity

#69 Postby Macrocane » Thu Dec 22, 2011 3:01 pm

:uarrow: Yes there's Conchagua volcano in there (thanks for the map) although the seismologists say that the cause are local fault lines and not directly related to Conchagua.

Since the swarm began 1623 quakes have been registered in the area but "only" 49 have been felt, the last one occurred on December 19 and had a magnitude of 3.2, and intensity of III in El Carmen and it was 4.5 km deep. Fortunately the number of quakes per day has diminished significantly in the last couple of weeks.

Another earthquake occurred before dawn in San Salvador:

Date: Decemeber 22 2011
Local Time: 05:29
Location: San Salvador metropolitan area.
Depth: 4.4 km
Magnitude: 2.8
Intensity: III in San Salvador.
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Re: El Salvador seismic activity

#70 Postby Macrocane » Thu Feb 02, 2012 12:21 am

A moderate quake caused alarm in El Salvador tonight, fortunately no damages or injuries have been reported.

SNET
Date: February 1 2012
Local Time: 22:24
Latitude (N): 13.118
Longitude (W): -89.38
Location: 40 km south of La Libertad's coast (central coast of El Salvador)
Depth (km): 45.1
Magnitude: 5.0
Intensity: V in San Salvador

USGS
Magnitude 4.6
Date-Time Wednesday, February 01, 2012 at 10:24:22 PM at epicenter
Location 13.332°N, 89.300°W
Depth 93.7 km (58.2 miles)
Region OFFSHORE EL SALVADOR
Distances 39 km (24 miles) S (191°) from Antiguo Cuscatlán, La Libertad, El Salvador
40 km (25 miles) SSW (201°) from SAN SALVADOR, El Salvador
Location Uncertainty horizontal +/- 20.4 km (12.7 miles); depth +/- 10.2 km (6.3 miles)
Parameters NST=203, Nph=234, Dmin=447.5 km, Rmss=1.2 sec, Gp=112°, M-type=body wave magnitude (Mb), Version=6
Source Magnitude: USGS NEIC (WDCS-D) Location: USGS NEIC (WDCS-D)
Event ID usb0007ufw
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Re: El Salvador seismic activity

#71 Postby Macrocane » Sun Feb 05, 2012 12:04 pm

2 new moderate quakes have been registered almost is the same place in the subduction zone and with similar magnitude, it's kind of rare to have quakes with that magnitude in the same area and so close in time.

FEBRUARY 4

SNET
Date: February 4 2012
Local Time: 05:06
Latitude (N): 13.2
Longitude (W): -89.328
Location: 35 km south of La Libertad's coast (central coast of El Salvador)
Depth (km): 62.2
Magnitude: 4.4
Intensity: III in San Salvador

USGS
Magnitude 4.3
Date-Time Saturday, February 04, 2012 at 11:06:45 UTC, Saturday, February 04, 2012 at 05:06:45 AM at epicenter
Location 13.319°N, 89.144°W
Depth 81.2 km (50.5 miles)
Region OFFSHORE EL SALVADOR
Distances 44 km (27 miles) S of SAN SALVADOR, El Salvador, 80 km (49 miles) ESE of Acajutla, El Salvador, 85 km (52 miles) SSE of Santa Ana, El Salvador, 1265 km (786 miles) ESE of MEXICO CITY, D.F., Mexico
Location Uncertainty horizontal +/- 34.2 km (21.3 miles); depth +/- 10.1 km (6.3 miles)
Parameters NST= 44, Nph= 49, Dmin=459.7 km, Rmss=1.21 sec, Gp=173°, M-type=body wave magnitude (Mb), Version=2
Source Magnitude: USGS NEIC (WDCS-D) Location: USGS NEIC (WDCS-D)
Event ID usb0007vqm

FEBRUARY 5

SNET
Date: February 5 2012
Local Time: 08:19
Latitude (N): 13.263
Longitude (W): -89.181
Location: 15 km south of San Diego Beach (central coast of El Salvador)
Depth (km): 83.0
Magnitude: 5.1
Intensity: IV in San Salvador

USGS
Magnitude 4.8
Date-Time Sunday, February 05, 2012 at 14:19:39 UTC, Sunday, February 05, 2012 at 08:19:39 AM at epicenter
Location 13.319°N, 89.030°W
Depth 92.6 km (57.5 miles) set by location program
Region OFFSHORE EL SALVADOR
Distances 47 km (29 miles) SSE of SAN SALVADOR, El Salvador
91 km (56 miles) ESE of Acajutla, El Salvador
92 km (57 miles) SE of Santa Ana, El Salvador
1275 km (792 miles) ESE of MEXICO CITY, D.F., Mexico
Location Uncertainty horizontal +/- 4.5 km (2.8 miles); depth fixed by location program
Parameters NST=197, Nph=197, Dmin=46.2 km, Rmss=0.88 sec, Gp= 97°,
M-type=body wave magnitude (Mb), Version=7
Source USGS NEIC (WDCS-D)
Event ID us2012wqa1
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Re: El Salvador seismic activity

#72 Postby Macrocane » Wed Mar 21, 2012 3:52 pm

EARTHQUAKE SWARM IN SAN SALVADOR

7 Earthquakes were registered in El Salvador in less than 12 hours. 6 of them with epicenter near San Salvador volcano and they were felt only in the metropolitan area of San Salvador, the other one was in the subduction zone and was felt in the whole country, no damages have been reported fortunately. The SNET has said that the quakes near the volcano are because of an active fault line and they're not directly related to the volcano activity. This is the info.

Date: March 21 2011
Local Time: 01:22
Location: San Salvador volcano.
Depth: 4.9 km
Magnitude: 2.6
Intensity: II in San Salvador.

Date: March 21 2011
Local Time: 01:34
Location: San Salvador volcano.
Depth: 5.9 km
Magnitude: 2.7
Intensity: II in San Salvador.

Date: March 21 2011
Local Time: 01:46
Location: San Salvador volcano.
Depth: 5.3 km
Magnitude: 2.8
Intensity: II in San Salvador.

Date: March 21 2011
Local Time: 02:28
Location: San Salvador volcano.
Depth: 5.8 km
Magnitude: 2.9
Intensity: II in San Salvador.

Date: March 21 2011
Local Time: 05:59
Location: San Salvador volcano.
Depth: 0.5 km
Magnitude: 2.2
Intensity: II in San Salvador.

Date: March 21 2011
Local Time: 08:01
Location: San Salvador volcano.
Depth: 5.8 km
Magnitude: 3.3
Intensity: II in San Salvador.

Date: March 21 2011
Local Time: 11:26
Location: San Salvador volcano.
Depth: 34 km
Magnitude: 4.3
Intensity: III in San Salvador.
Last edited by Macrocane on Wed Mar 21, 2012 3:59 pm, edited 1 time in total.
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Re: El Salvador seismic activity

#73 Postby Macrocane » Wed Mar 21, 2012 3:55 pm

This is a map that shows the 6 quakes in the volcano, you can clearly see the crater. There are cities to the southwest, south, southeast, east (the capital) and northeast of the volcano.

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#74 Postby somethingfunny » Thu Mar 22, 2012 2:08 am

Was that powerful earthquake in Oaxaca felt in El Salvador?
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Re: El Salvador seismic activity

#75 Postby Macrocane » Fri Mar 23, 2012 3:15 pm

:uarrow: No, fortunately we didn't feel it.
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#76 Postby somethingfunny » Mon Aug 27, 2012 12:36 am

Macrocane, I created a thread for the 7.4 tonight.

viewtopic.php?f=67&t=113540&start=0&st=0&sk=t&sd=a
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