Major magnitude 7.5 earthquake - San Sebastian Coatlan, 26 km northeast of Puerto Escondido, Mexico, on Thursday, September 30, 1999 at 16:31 (GMT)

Major magnitude 7.5 earthquake - San Sebastian Coatlan, 26 km northeast of Puerto Escondido, Mexico, on Thursday, September 30, 1999 at 16:31 (GMT)

Major magnitude 7.5 earthquake at 61 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Sep 30, 1999 16:31:15 UTC
Magnitude: 7.5
Depth: 60.6 km
Epicenter latitude / longitude: 16.059°N / 96.931°W (San Sebastian Coatlan, Oaxaca, Mexico)
Antipode: 16.059°S / 83.069°E
Nearby towns and cities:
4 km (3 mi) NW of San José Llano Cieneguilla (pop: 972) --> See nearby quakes!
15 km (10 mi) W of San Baltazar Loxicha (pop: 2,180) --> See nearby quakes!
23 km (15 mi) ESE of Santos Reyes Nopala (pop: 5,200) --> See nearby quakes!
26 km (16 mi) NE of Puerto Escondido (pop: 25,900) --> See nearby quakes!
43 km (27 mi) ESE of Santa Catarina Juquila (pop: 6,220) --> See nearby quakes!
47 km (29 mi) SW of Miahuatlan de Porfirio Diaz (Miahuatlán de Porfirio Díaz) (pop: 23,900) --> See nearby quakes!
86 km (53 mi) SSW of Ocotlan de Morelos (pop: 15,000) --> See nearby quakes!
91 km (57 mi) WNW of Crucecita (pop: 15,100) --> See nearby quakes!
114 km (71 mi) S of Santa Maria (pop: 255,000) --> See nearby quakes!
441 km (274 mi) SSE of Mexico City (pop: 12,294,200) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.1 x 1016 joules (3117 gigawatt hours, equivalent to 2.7 x 106 tons of TNT or 167.6 atomic bombs!) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
7.561 kmOaxaca, MexicoUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake yet. If you felt it be the first to report it!
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Aftershocks

More info

Recorded aftershocks, latest first (569 quakes)

  • 01 Oct 2001 05:33 UTC
    | M 3.8 |
    125 km (77.7 mi) depth
    |
    216 km (134 mi) distance
    | USGS | Details
  • 30 Sep 2001 09:27 UTC
    | M 4.3 |
    203 km (126.1 mi) depth
    |
    336 km (209 mi) distance
    | USGS | Details
  • 29 Sep 2001 18:50 UTC
    | M 3.8 |
    81.9 km (50.9 mi) depth
    |
    268 km (166 mi) distance
    | USGS | Details
  • 29 Sep 2001 10:32 UTC
    | M 3.5 |
    35.9 km (22.3 mi) depth
    |
    71 km (44 mi) distance
    | USGS | Details
  • 29 Sep 2001 05:21 UTC
    | M 4.2 |
    16 km (9.9 mi) depth
    |
    263 km (164 mi) distance
    | USGS | Details
  • 28 Sep 2001 07:14 UTC
    | M 3.7 |
    127.4 km (79.2 mi) depth
    |
    218 km (136 mi) distance
    | USGS | Details
  • 27 Sep 2001 12:23 UTC
    | M 4.0 |
    13.7 km (8.5 mi) depth
    |
    265 km (165 mi) distance
    | USGS | Details
  • 27 Sep 2001 06:50 UTC
    | M 3.9 |
    16.1 km (10 mi) depth
    |
    159 km (99 mi) distance
    | USGS | Details
  • 27 Sep 2001 06:46 UTC
    | M 3.6 |
    2.4 km (1.5 mi) depth
    |
    310 km (193 mi) distance
    | USGS | Details
  • 26 Sep 2001 20:03 UTC
    | M 4.3 |
    5 km (3.1 mi) depth
    |
    185 km (115 mi) distance
    | USGS | Details
  • 26 Sep 2001 19:57 UTC
    | M 4.3 |
    10 km (6.2 mi) depth
    |
    178 km (110 mi) distance
    | USGS | Details
  • 25 Sep 2001 19:59 UTC
    | M 3.8 |
    41.2 km (25.6 mi) depth
    |
    289 km (180 mi) distance
    | USGS | Details
  • 25 Sep 2001 09:27 UTC
    | M 4.1 |
    91.4 km (56.8 mi) depth
    |
    48 km (30 mi) distance
    | USGS | Details
  • 23 Sep 2001 08:09 UTC
    | M 3.8 |
    122.5 km (76.1 mi) depth
    |
    247 km (153 mi) distance
    | USGS | Details
  • 18 Sep 2001 12:44 UTC
    | M 3.8 |
    33 km (20.5 mi) depth
    |
    280 km (174 mi) distance
    | USGS | Details
  • 18 Sep 2001 08:01 UTC
    | M 3.8 |
    61.8 km (38.4 mi) depth
    |
    81 km (50 mi) distance
    | USGS | Details
  • Show all

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