Major magnitude 7.0 earthquake - North Pacific Ocean, 77 mi west of North West Seal Rock Island, Del Norte County, California, USA, on Saturday, August 17, 1991 at 22:17 (GMT)

Major magnitude 7.0 earthquake - North Pacific Ocean, 77 mi west of North West Seal Rock Island, Del Norte County, California, USA, on Saturday, August 17, 1991 at 22:17 (GMT)

Major magnitude 7.0 earthquake at 1 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Date & time: Aug 17, 1991 22:17:09 UTC
Magnitude: 7
Depth: 1.3 km
Epicenter latitude / longitude: 41.679°N / 125.856°W (North Pacific Ocean, Oregon, United States)
Antipode: 41.679°S / 54.144°E
Nearest volcano: Central Segment (105 km / 65 mi)
Nearby towns and cities:
137 km (85 mi) WSW of Brookings (Curry County) (pop: 6,480) --> See nearby quakes!
168 km (104 mi) WNW of McKinleyville (Humboldt County, California) (pop: 15,200) --> See nearby quakes!
172 km (107 mi) NW of Eureka (Humboldt County, California) (pop: 27,000) --> See nearby quakes!
174 km (108 mi) WNW of Uniontown (Humboldt County, California) (pop: 17,800) --> See nearby quakes!
176 km (110 mi) WNW of Bayside (Humboldt County, California) (pop: 17,100) --> See nearby quakes!
225 km (140 mi) WSW of Grants Pass (Josephine County) (pop: 37,100) --> See nearby quakes!
231 km (143 mi) SW of Coos Bay (Coos County) (pop: 16,200) --> See nearby quakes!
257 km (159 mi) WSW of Medford (pop: 79,800) --> See nearby quakes!
315 km (195 mi) WNW of Redding (California) (pop: 91,600) --> See nearby quakes!
347 km (216 mi) SW of Eugene (pop: 163,500) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2 x 1015 joules (554 gigawatt hours, equivalent to 4.8 x 105 tons of TNT or 29.8 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
7.01.3 km136km WSW of Brookings, Oregon (USA)USGS
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.
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Aftershocks

More info

Recorded aftershocks, latest first (2686 quakes)

  • 18 Aug 1993 14:00 UTC
    | M 2.6 |
    20.4 km (12.7 mi) depth
    |
    188 km (117 mi) distance
    | USGS | Details
  • 18 Aug 1993 02:47 UTC
    | M 2.8 |
    2 km (1.2 mi) depth
    |
    139 km (86 mi) distance
    | USGS | Details
  • 17 Aug 1993 22:03 UTC
    | M 1.5 |
    3.8 km (2.4 mi) depth
    |
    172 km (107 mi) distance
    | USGS | Details
  • 17 Aug 1993 08:26 UTC
    | M 3.3 |
    0.4 km (0.2 mi) depth
    |
    147 km (92 mi) distance
    | USGS | Details
  • 17 Aug 1993 02:34 UTC
    | M 1.9 |
    20.6 km (12.8 mi) depth
    |
    177 km (110 mi) distance
    | USGS | Details
  • 17 Aug 1993 00:48 UTC
    | M 1.8 |
    14.6 km (9.1 mi) depth
    |
    178 km (111 mi) distance
    | USGS | Details
  • 15 Aug 1993 21:57 UTC
    | M 1.2 |
    4 km (2.5 mi) depth
    |
    191 km (119 mi) distance
    | USGS | Details
  • 15 Aug 1993 19:08 UTC
    | M 1.3 |
    7.2 km (4.5 mi) depth
    |
    191 km (119 mi) distance
    | USGS | Details
  • 15 Aug 1993 01:47 UTC
    | M 1.4 |
    18.6 km (11.6 mi) depth
    |
    177 km (110 mi) distance
    | USGS | Details
  • 14 Aug 1993 20:35 UTC
    | M 1.9 |
    19.6 km (12.2 mi) depth
    |
    191 km (119 mi) distance
    | USGS | Details
  • 14 Aug 1993 19:38 UTC
    | M 1.7 |
    22.7 km (14.1 mi) depth
    |
    180 km (112 mi) distance
    | USGS | Details
  • 14 Aug 1993 16:55 UTC
    | M 1.9 |
    4.5 km (2.8 mi) depth
    |
    166 km (103 mi) distance
    | USGS | Details
  • 14 Aug 1993 16:38 UTC
    | M 2.1 |
    21 km (13 mi) depth
    |
    159 km (99 mi) distance
    | USGS | Details
  • 14 Aug 1993 11:13 UTC
    | M 1.6 |
    12.9 km (8 mi) depth
    |
    178 km (111 mi) distance
    | USGS | Details
  • 13 Aug 1993 23:55 UTC
    | M 1.4 |
    16 km (9.9 mi) depth
    |
    191 km (119 mi) distance
    | USGS | Details
  • 13 Aug 1993 14:51 UTC
    | M 2.3 |
    -0.4 km (-0.2 mi) depth
    |
    155 km (96 mi) distance
    | USGS | Details
  • Show all

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