| 山形県沖地震 | |
 
| |
| UTC time | 2019-06-18 13:22:20 |
|---|---|
| ISC event | 615958611 |
| USGS-ANSS | ComCat |
| Local date | June 18, 2019 (2019-06-18) |
| Local time | 10:22 p.m. JST |
| Magnitude | 6.4 Mw
(USGS) 6.7 MJMA (JMA) |
| Depth | 10 km (6 mi) |
| Epicenter | 38°38′06″N 139°27′14″E / 38.635°N 139.454°E / 38.635; 139.454 |
| Type | Reverse |
| Areas affected | Ishikawa Prefecture, Miyagi Prefecture, Niigata Prefecture, Yamagata Prefecture, and southern Akita Prefecture[1] |
| Max. intensity | MMI VII (Very strong) JMA 6+ |
| Tsunami | Yes (up to 10 cm (4 in))[2][3] |
| Casualties | 26 injured |
The 2019 Yamagata earthquake (山形県沖地震, Yamagata-ken Oki Jishin)[1] was an earthquake of magnitude 6.4 Mw which struck primarily the Hokuriku regioninJapan on 18 June 2019 at 22:22 JST (13:22 UTC). The epicenter was close to the city of Tsuruoka, Yamagata.[4][5][2][3]Atsunami warning was also issued.[2][3]
The northwestern side of Honshu lies on the southeastern margin of the Sea of Japan, an area of oceanic crust created by back-arc spreading from the late Oligocenetomiddle Miocene. The extensional tectonics associated with the spreading formed a series of N-S trending extensional faults and associated basins. The crust in this area is subjected to east–west compression associated with the convergent boundary between the Amur Plate and the Okhotsk Plate[A]. As a result of this strain, the north–south trending extensional faults are reactivated in a reverse sense.[6] The 1964 Niigata earthquake, the 1983 Sea of Japan earthquake, and the 1993 Hokkaidō earthquake were all a result of similar processes.[7]
The magnitude 6.4 earthquake triggered a tsunami advisory for three prefectures in Japan.[8][5] A tsunami with a height of 10 cm was reported in Niigata.[9] The earthquake damaged a total of 149 homes in Akita, Niigata, and Yamagata prefectures.[10]
Twenty-six people were reported to be injured, mostly by fallen debris.[11]
Sections of the Nihonkai-Tōhoku Expressway and Yamagata Expressway were closed by the East Nippon Expressway Company. National Route 345 was blocked by fallen debris in Murakami.[12]
Tohoku Electric Power announced that a blackout occurred in parts of Yamagata and Niigata prefectures because of the earthquake, with 1000 customers impacted in Tsuruoka and 200 customers impacted in Sakata.[13] As a safety precaution, gas services were interrupted in Niigata Prefecture.[14]
This chart describes the maximum perceived shaking using the Japan Meteorological Agency seismic intensity scale, or Shindo scale, for the earthquake throughout the impacted area.
| Intensity | Prefecture | City or municipality name |
|---|---|---|
| 6+ | Niigata | Murakami |
| 6- | Yamagata | Atsumigawa, Tsuruoka |
| 5+ | Atsumi, Tsuruoka, Michidamachi, Tsuruoka | |
| 5- | Niigata | Nagaoka, Kashiwazaki, Aga |
| Yamagata | Other areas in Tsuruoka, Sakata, Ōkura, Mikawa | |
| Akita | Yurihonjō |
Explanatory notes
Citations
|
| |
|---|---|
| January |
|
| March |
|
| April |
|
| May |
|
| June |
|
| July |
|
| August |
|
| September |
|
| October |
|
| November |
|
| December |
|
| |
Japan
