Reviewed by USGSIndia97y ago
M7.0 earthquake 28 km SSW of Lakhipur, India
Wednesday, July 2, 1930, 21:03:43 UTC · 25.807°N, 90.168°E
A magnitude 7.0 earthquake struck 28 km SSW of Lakhipur, India on Wednesday, July 2, 1930, 21:03:43 UTC, at a depth of 15.0 km (shallow). It is the strongest earthquake within 300 km since an M7.1 on July 8, 1918.
- Magnitude
- 7.0
- Strong · mw
- Depth
- 15 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 earthquakeDashed circle: 100 km aftershock search areaColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
415 kilotons of TNT
That is about 28 times the Hiroshima bomb. It released about 871 times the energy of a magnitude 5.0.
Tectonic setting
121 km
from the nearest mapped plate boundary, between the Eurasian and Indian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: shallow
15 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 100 km
USGS lists 2 M2.5+ earthquakes within 100 km in the following 30 days; the largest was M5.8 on July 3, 1930. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 3 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 9 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 1,669 recorded deaths. The most severe:
- 1897M8.0
Assam; Bangladesh
12 Jun 1897 · 57 km away · intensity X
1,542 deathsExtreme damage ($25M+)tsunami
- 1885M6.9
Unnamed location
14 Jul 1885 · 131 km away · intensity VII
75 deathsModerate damage ($1–5M)
- 1923M6.9
Mymensingh
9 Sep 1923 · 110 km away
50 deathsModerate damage ($1–5M)
- 1869
Assam: Cachar,Silchar
10 Jan 1869 · 276 km away
2 deathsSevere damage ($5–24M)
- 1930M7.1
Dhubri,Assam
2 Jul 1930 · 38 km away · intensity IX
Severe damage ($5–24M)
- 1918M7.6
Srimangal
8 Jul 1918 · 168 km away
Moderate damage ($1–5M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.