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Quake Info: Light Mag. 4.2 Earthquake - Inland Sea of Japan, 29 km Northeast of Matsuyama, Ehime, Japan, on Thursday, Jul 8, 2021 at 2:39 am (GMT +9) - 4 User Experience Reports

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Light mag. 4.2 earthquake - Inland Sea of Japan, 29 km northeast of Matsuyama, Ehime, Japan, on Thursday, Jul 8, 2021 at 2:39 am (GMT +9)

Light magnitude 4.2 earthquake at 43 km depth

7 Jul 17:43 UTC: First to report: VolcanoDiscovery after 4 minutes.
7 Jul 17:45: Now using data updates from NIED

Update Wed, 7 Jul 2021, 17:54

Moderate magnitude 4.2 earthquake 29 km northeast of Matsuyama, Japan

4.2 quake 8 Jul 2:39 am (GMT +9)

A magnitude 4.2 earthquake near Matsuyama, Matsuyama-shi, Ehime, Japan, was reported only 15 minutes ago by Japan's National Research Institute for Earth Science and Disaster Resilience (NIED), considered the main national agency that monitors seismic activity in this part of the world. The earthquake occurred at a moderately shallow depth of 43.1 km beneath the epicenter early morning on Thursday 8 July 2021 at 2:39 am local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.0 earthquake.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Hōjō (pop. 28,000) located 16 km from the epicenter, Matsuyama (pop. 443,300) 29 km away, Takehara (pop. 30,500) 29 km away, Saijō (pop. 58,800) 31 km away, Kure (pop. 196,600) 35 km away, Niihama (pop. 123,100) 39 km away, Mihara (pop. 80,400) 40 km away, and Onomichi (pop. 90,900) 47 km away.

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Earthquake details

Date & time	Jul 7, 2021 17:39:06 UTC
Local time at epicenter	Thursday, Jul 8, 2021 at 2:39 am (GMT +9)
Status	Confirmed
Magnitude	4.2
Depth	43.1 km
Epicenter latitude / longitude	34.076°N / 132.902°E (Inland Sea of Japan, Japan)
Antipode	34.076°S / 47.098°W
Shaking intensity	Light shaking
Felt	4 reports
Primary data source	NIED (National Research Institute for Earth Science and Disaster Resilience)
Nearest volcano	Sanbe (120 km / 75 mi)
Nearby towns and cities	16 km (10 mi) NE of Hōjō (Matsuyama) (pop: 28,000) \| Show on map \| Quakes nearby 29 km (18 mi) NNE of Matsuyama (pop: 443,300) \| Show on map \| Quakes nearby 29 km (18 mi) S of Takehara (pop: 30,500) \| Show on map \| Quakes nearby 31 km (20 mi) NW of Saijo (pop: 58,800) \| Show on map \| Quakes nearby 35 km (22 mi) ESE of Kure (pop: 196,600) \| Show on map \| Quakes nearby 39 km (24 mi) WNW of Niihama (pop: 123,100) \| Show on map \| Quakes nearby 40 km (25 mi) SSW of Mihara (pop: 80,400) \| Show on map \| Quakes nearby 47 km (29 mi) SW of Onomichi (pop: 90,900) \| Show on map \| Quakes nearby 55 km (34 mi) SE of Hiroshima (pop: 1,143,800) \| Show on map \| Quakes nearby 645 km (401 mi) WSW of Tokyo (pop: 8,336,600) \| Show on map \| Quakes nearby 45 km (28 mi) E of Hashira Island (pop: 184) \| Show on map \| Quakes nearby 66 km (41 mi) WNW of Shikoku Island (pop: 4,142,000) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Light Rain 27°C (81 F), humidity: 91%, wind: 3 m/s (6 kts) from SW
Estimated seismic energy released	1.3 x 10¹¹ joules (35 megawatt hours, equivalent to 30.1 tons of TNT) \| about seismic energy

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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.	Depth	Location	Source
4.2	43 km	Near Hiroshima, Hiroshima, Japan	NIED
4.0	40 km	WESTERN HONSHU, JAPAN	EMSC

Most recent quakes Top 20 past 24 hrs Quakes in Japan

Seismograms

Seismic station: Kochi Monobe (JMN/JP network) | Distance from quake: 98 km / 61 mi | Show on map | Station Info

Seismic station Kochi Monobe: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.2-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

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Seismic station Kochi Monobe: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Kochi Monobe: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake, showing horizontal E-W and N-S ground movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Oita Nakatsue (JNU/JP network) | Distance from quake: 215 km / 134 mi | Show on map | Station Info

Seismic station Oita Nakatsue: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Oita Nakatsue: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Oita Nakatsue: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Tsushima Kamiagata (JTU/JP network) | Distance from quake: 326 km / 202 mi | Show on map | Station Info

Seismic station Tsushima Kamiagata: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Tsushima Kamiagata: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Tsushima Kamiagata: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Matsushiro, Japan (MAJO/IU network) | Distance from quake: 554 km / 344 mi | Show on map | Station Info

Seismic station Matsushiro, Japan: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station Matsushiro, Japan: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Matsushiro, Japan: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Okinawa Kunigami (JOW/JP network) | Distance from quake: 919 km / 571 mi | Show on map | Station Info

Seismic station Okinawa Kunigami: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station Okinawa Kunigami: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Okinawa Kunigami: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

User reports for this quake (4)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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Iwakuni / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : Had woken up randomly a few minutes before and as I was trying to fall back asleep it happened | One user found this interesting.

Hiroshima (56.9 km NW of epicenter) [Map] / Light shaking (MMI IV) / complex motion difficult to describe / 1-2 s

Yamaguchi (62.7 km W of epicenter) [Map] / Moderate shaking (MMI V) / vibration and rolling / 2-5 s : Scared

Iwakuni / Weak shaking (MMI III) / rattling, vibrating / 2-5 s

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