Reviewed by USGSMyanmar104y ago
M7.3 earthquake 99 km E of Lashio, Myanmar
Friday, June 22, 1923, 06:44:39 UTC · 22.817°N, 98.711°E
A magnitude 7.3 earthquake struck 99 km E of Lashio, Myanmar on Friday, June 22, 1923, 06:44:39 UTC, at a depth of 25.0 km (shallow). It is the strongest earthquake within 300 km since an M7.9 on May 23, 1912.
- Magnitude
- 7.3
- Major · mw
- Depth
- 25 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VII
- Very strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
1.2 megatons of TNT
That is about 78 times the Hiroshima bomb. It released about 2,455 times the energy of a magnitude 5.0.
Tectonic setting
287 km
from the nearest mapped plate boundary, between the Indian and Eurasian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
25 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 200 km
USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 2 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 6 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 418 recorded deaths. The most severe:
- 1839
Ava, Amarapura
23 Mar 1839 · 297 km away · intensity XI
400 deathsSevere damage ($5–24M)
- 1884M6.5
Yunnan Province
14 Nov 1884 · 246 km away · intensity VIII
17 deathsModerate damage ($1–5M)
- 1906M5.3
Yunnan Province
May 1906 · 199 km away · intensity VII
1 deathModerate damage ($1–5M)
- 1912M8.0
Mandalay, Mogok, Maymyo
23 May 1912 · 268 km away · intensity IX
Severe damage ($5–24M)
- 1876M6.0
Yunnan Province
5 Aug 1876 · 296 km away · intensity VIII
Moderate damage ($1–5M)
- 1770M5.5
Yunnan Province
26 Sep 1770 · 232 km away · intensity VII
Limited damage (under $1M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.