Earthquake of moderate magnitude 4.0 at a depth of 11 km
June 30 12:44 UTC: First reported: NIED after 7 minutes.
Update Wed, 30 Jun 2021, 12:48
A 4.0 magnitude earthquake struck near Hasaki, Chōshi-shi, Chiba, Japan
Earthquake 4.0 Jun 30 21:37 (GMT +9)
A magnitude 4.0 earthquake near Hasaki, Chōshi-shi, Chiba, Japan, was reported just 11 minutes ago by the Japan National Research Institute for Earth Sciences and Disaster Resilience (NIED), which is considered the main national agency that monitors seismic activity in parts of the world. this. world. The earthquake occurred at a shallow depth of 11 km below the epicenter on the evening of Wednesday 30 June 2021 at 21:37 local time. The exact magnitude, epicenter, and depth of the quake may be revised in the next few hours or minutes as seismologists review the data and refine their calculations, or when other agencies issue their reports.
Our monitoring service identified a second report from the European-Mediterranean Center for Seismology (EMSC) listing a 4.3 magnitude earthquake.
Based on preliminary seismic data, the quake should have caused no significant damage, but may be felt by many as a light tremor in the epicenter area.
Weak tremors may be felt at Hasaki (pop. 39,200) which is 6 km from the epicenter, Asahi (pop. 41,700) 23 km away, and Omigawa (pop. 25,800) 28 km away.
Other cities near the epicenter where the quake might be felt as a very weak tremor include Yōkaichiba (pop. 32,700) which is 32 km from the epicenter, Kashima-shi (pop. 65,800) 34 km away, Sawara (pop. 47,200). ) 40 km away, Katori-shi (pop. 83,200) 40 km, and Narita (pop. 100,600) 53 km.
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Date & time: 30 Jun 2021 12:37:30 UTC –
Local time at the epicenter: Wednesday, 30 Jun 2021 21:37 (GMT +9)
Depth: 11.0 km
Latitude / longitude epicenter: 35,742°N / 140,903°E
(North Pacific Ocean, Japan)
Nearest volcano: Takahara (163 km / 101 mi)
Nearest cities and towns:
6 km (4 miles) east of Hashi (pop: 39,200) –> Check out the nearest earthquake!
23 km (14 mi) northeast Asahi (pop: 41,700) –> Check out the nearest earthquake!
28 km (18 mi) northeast of Omigawa (Katori) (pop: 25,800) –> Check out the nearest earthquake!
32 km (20 mi) east of Yukaichiba (Sosa) (pop: 32,700) –> Check out the nearest earthquake!
34 km (21 mi) southeast of Kashima-shi (pop: 65,800) –> Check out the nearest earthquake!
40 km (25 mi) ESE from Sawara (pop: 47,200) –> Check out the nearest earthquake!
40 km (25 mi) ESE from Katori-shi (pop: 83,200) –> Check out the nearest earthquake!
53 km (33 mi) northeast Narita (pop: 100,600) –> Check out the nearest earthquake!
110 km (68 miles) east of Tokyo (pop: 8,336,600) –> Check out the nearest earthquake!
118 km (74 mi) northeast of Yokohama (pop: 3,574,400) –> Check out the nearest earthquake!
220 km (137 mi) NE from Shikine-jima Island (pop: 600) –> Check out the nearest earthquake!
Cloudy sky 21.2°C (70 F), humidity: 79%, wind: 4 m/s (8 kts) from ESE
Primary data source: NIED (National Research Institute for Earth Science and Disaster Resilience)
Approximate energy released: 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 tons of TNT) More info
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Data for the same earthquake reported by different agencies
Info: The more agencies report about the same earthquake and post similar data, the more trust you can have in the data. It usually takes up to several hours for earthquake parameters to be calculated with near optimal precision.
|4.0||11 km||Japan: NEAR CHOSHI CITY||NIED|
|4.2||10 km||NEAR HONSHU EAST BEACH, JAPAN||EMSC|
|4.2||10 km||11 Km NNE Kashima-shi, Japan||USGS|
User reports for this earthquake (1)
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Tsuchiura / Weak shaking (MMI III) / crackling, shaking / 2-5 s
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