Very strong mag. 6.8 earthquake - Indian Ocean, 70 km west of Sibolga, North Sumatra, Indonesia, on Friday, 1 April 1921 at 04:06 (GMT)
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Very strong magnitude 6.8 earthquake at 35 km depth
Depth: 35.0 km
Epicenter latitude / longitude: 1.77°N / 98.148°E (Indian Ocean, Indonesia)
Nearest volcano: Helatoba-Tarutung (92 km / 57 mi)
Nearby towns and cities:
70 km (44 mi) SE of Singkil (pop: 46,800) --> See nearby quakes!
70 km (44 mi) W of Sibolga (pop: 79,700) --> See nearby quakes!
132 km (82 mi) WNW of Padangsidempuan (pop: 100,600) --> See nearby quakes!
132 km (82 mi) SSW of Tongging (Kabupaten Karo) (pop: 16,000) --> See nearby quakes!
153 km (95 mi) SSW of Kabanjahe (pop: 57,200) --> See nearby quakes!
167 km (104 mi) SW of Pematangsiantar (pop: 209,600) --> See nearby quakes!
191 km (119 mi) WSW of Rantauprapat (pop: 103,000) --> See nearby quakes!
210 km (130 mi) SSW of Medan (pop: 1,751,000) --> See nearby quakes!
389 km (242 mi) NW of Padang (pop: 840,400) --> See nearby quakes!
422 km (262 mi) WSW of Kuala Lumpur (Malaysia) (pop: 1,454,000) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1 x 1015 joules (278 gigawatt hours, equivalent to 2.4 x 105 tons of TNT or 14.9 atomic bombs!) More info
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.
|6.8||35 km||northern Sumatra, Indonesia||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
More infoRecorded aftershocks, latest first (0 quakes):
So far, no aftershocks have been registered.