Very strong mag. 6.8 earthquake - Mindanao Sea, 17 km southeast of Olutanga Island, Philippines, on Tuesday, 17 August 1976 at 04:19 (GMT)
Very strong magnitude 6.8 earthquake at 22 km depth
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Date & time: 17 Aug 1976 04:19:27 UTC
Magnitude: 6.8Depth: 22.0 km
Epicenter latitude / longitude: 7.249°N / 122.939°E
(
Mindanao Sea,
Philippines)
Nearest volcano:
Kaladis (37 km / 23 mi)
Nearby towns and cities:12 km (8 mi) ESE of Olutanga (pop: 7,130) -->
See nearby quakes!71 km (44 mi) SE of Ipil (Zamboanga Sibugay) (pop: 19,200) -->
See nearby quakes!84 km (52 mi) SW of Pagadian (pop: 186,900) -->
See nearby quakes!88 km (54 mi) SW of Muricay (pop: 132,100) -->
See nearby quakes!103 km (64 mi) ENE of Zamboanga City (pop: 457,600) -->
See nearby quakes!113 km (70 mi) ENE of Recodo (pop: 42,800) -->
See nearby quakes!123 km (76 mi) ENE of Isabela (pop: 67,300) -->
See nearby quakes!141 km (88 mi) SW of Ozamiz (pop: 93,100) -->
See nearby quakes!144 km (90 mi) W of Cotabato City (pop: 179,400) -->
See nearby quakes!846 km (525 mi) SSE of Manila (pop: 1,600,000) -->
See nearby quakes!Primary data source:
USGS (United States Geological Survey)
Estimated released energy: 1 x 10
15 joules (278 gigawatt hours, equivalent to 2.4 x 10
5 tons of TNT or 14.9 atomic bombs!)
More info[show map]
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Data for the same earthquake reported by different agencies
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| Magnitude | Depth | Location | Source |
| M 6.8 | 22 km | Mindanao, Philippines | USGS |
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Aftershocks
More info
Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 631 km
2 (=244 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 44 km (27 mi).
Aftershocks typically occur during the weeks and months following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the
map below to verify).
22 Nov 1976 04:22 UTC
| M 6.0 | 60 km (37.3 mi) depth
| 75 km (46 mi) distance
| USGS | Strong mag. 6.0 earthquake - Mindanao Sea, 77 km west of Cotabato City, Philippines, on Monday, 22 November 1976 at 04:22 (GMT)07 Nov 1976 01:24 UTC
| M 4.8 | 29 km (18 mi) depth
| 61 km (38 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details01 Nov 1976 20:25 UTC
| M 4.9 | 48 km (29.8 mi) depth
| 78 km (48 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details22 Oct 1976 14:51 UTC
| M 5.6 | 33 km (20.5 mi) depth
| 59 km (37 mi) distance
| USGS | Details07 Oct 1976 08:31 UTC
| M 5.1 | 14 km (8.7 mi) depth
| 58 km (36 mi) distance
| USGS | Details30 Sep 1976 07:14 UTC
| M 4.6 | 33 km (20.5 mi) depth
| 93 km (58 mi) distance
| USGS | Details29 Sep 1976 10:35 UTC
| M 4.2 | 60 km (37.3 mi) depth
| 72 km (45 mi) distance
| USGS | Details25 Sep 1976 03:50 UTC
| M 5.2 | 33 km (20.5 mi) depth
| 104 km (64 mi) distance
| USGS | Details25 Sep 1976 03:30 UTC
| M 5.7 | 45 km (28 mi) depth
| 107 km (67 mi) distance
| USGS | Details22 Sep 1976 12:00 UTC
| M 4.5 | 33 km (20.5 mi) depth
| 106 km (66 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details17 Sep 1976 06:08 UTC
| M 4.9 | 58 km (36 mi) depth
| 70 km (43 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | DetailsShow all
14 Sep 1976 08:10 UTC
| M 4.8 | 33 km (20.5 mi) depth
| 79 km (49 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details12 Sep 1976 18:02 UTC
| M 5.0 | 36 km (22.4 mi) depth
| 60 km (37 mi) distance
| USGS | Details11 Sep 1976 12:57 UTC
| M 5.3 | 33 km (20.5 mi) depth
| 73 km (45 mi) distance
| USGS | Details10 Sep 1976 20:35 UTC
| M 5.0 | 33 km (20.5 mi) depth
| 95 km (59 mi) distance
| USGS | Details06 Sep 1976 01:42 UTC
| M 5.4 | 25 km (15.5 mi) depth
| 100 km (62 mi) distance
| USGS | Details03 Sep 1976 02:04 UTC
| M 5.1 | 24 km (14.9 mi) depth
| 109 km (67 mi) distance
| USGS | Details28 Aug 1976 22:01 UTC
| M 4.9 | 55 km (34.2 mi) depth
| 55 km (34 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details28 Aug 1976 15:40 UTC
| M 4.7 | 34 km (21.1 mi) depth
| 75 km (46 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details25 Aug 1976 17:44 UTC
| M 4.8 | 52 km (32.3 mi) depth
| 97 km (60 mi) distance
| USGS | Details21 Aug 1976 20:13 UTC
| M 4.9 | 63 km (39.1 mi) depth
| 94 km (58 mi) distance
| USGS | Details21 Aug 1976 16:31 UTC
| M 5.0 | 63 km (39.1 mi) depth
| 90 km (56 mi) distance
| USGS | Details21 Aug 1976 09:46 UTC
| M 5.1 | 72 km (44.7 mi) depth
| 104 km (64 mi) distance
| USGS | Details21 Aug 1976 07:34 UTC
| M 5.4 | 70 km (43.5 mi) depth
| 105 km (65 mi) distance
| USGS | Details21 Aug 1976 02:24 UTC
| M 4.6 | 80 km (49.7 mi) depth
| 105 km (65 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details20 Aug 1976 05:51 UTC
| M 5.1 | 33 km (20.5 mi) depth
| 63 km (39 mi) distance
| USGS | Details19 Aug 1976 17:07 UTC
| M 5.3 | 33 km (20.5 mi) depth
| 84 km (52 mi) distance
| USGS | Details18 Aug 1976 20:27 UTC
| M 5.7 | 33 km (20.5 mi) depth
| 91 km (56 mi) distance
| USGS | Details18 Aug 1976 15:06 UTC
| M 5.1 | 48 km (29.8 mi) depth
| 66 km (41 mi) distance
| USGS | Details18 Aug 1976 15:04 UTC
| M 4.5 | 33 km (20.5 mi) depth
| 77 km (48 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details18 Aug 1976 14:33 UTC
| M 4.8 | 33 km (20.5 mi) depth
| 16 km (10 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details18 Aug 1976 10:48 UTC
| M 5.1 | 30 km (18.6 mi) depth
| 106 km (66 mi) distance
| USGS | Details18 Aug 1976 02:34 UTC
| M 4.8 | 41 km (25.5 mi) depth
| 24 km (15 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details17 Aug 1976 23:29 UTC
| M 5.3 | 30 km (18.6 mi) depth
| 83 km (52 mi) distance
| USGS | Details17 Aug 1976 18:55 UTC
| M 4.6 | 33 km (20.5 mi) depth
| 13 km (8 mi) distance
| USGS | Details01 Jan 1970 00:00 UTC
| M | 0 km (0 mi) depth
| 13641 km (8476 mi) distance
| | Details17 Aug 1976 17:05 UTC
| M 5.2 | 57 km (35.4 mi) depth
| 84 km (52 mi) distance
| USGS | Details17 Aug 1976 08:57 UTC
| M 5.4 | 49 km (30.4 mi) depth
| 51 km (32 mi) distance
| USGS | Details17 Aug 1976 07:53 UTC
| M 5.6 | 14 km (8.7 mi) depth
| 40 km (25 mi) distance
| USGS | Details17 Aug 1976 07:48 UTC
| M 5.1 | 40 km (24.9 mi) depth
| 13 km (8 mi) distance
| USGS | Details
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