FLASH REPORT · EQ
M4.8 earthquake — Off the east Coast of Chiba Prefecture
An earthquake occurred at Off the east Coast of Chiba Prefecture. JMA reports magnitude 4.8, a depth of 30 km, maximum observed intensity of Shindo 4. GDACS currently provides a Green alert and rapid-impact estimates.
At a glance
- Occurred
- Aug 29, 2026, 15:17 UTC
- Location
- Off the east Coast of Chiba Prefecture
- Magnitude
- JMA M4.8 · GDACS M4.7
- Depth
- JMA 30 km · GDACS 35 km
- Maximum observed intensity
- JMA Shindo 4
- GDACS alert
- GREEN
What we know
OBSERVED SHAKING — JMA
Japan Meteorological Agency observations
Maximum observed seismic intensity: JMA Shindo 4.
JMA magnitude: 4.8.
JMA depth: 30 km.
ESTIMATED IMPACT — GDACS
Global Disaster Alert and Coordination System
Current GDACS alert: Green.
GDACS rapid-impact intensity geometry is an estimate, not observed JMA shaking.
Report history
-
A newly associated source was added to the report; GDACS changed the alert to Green; GDACS revised event details; GDACS detailed geometry was added or revised.
-
JMA revised earthquake measurements.
-
Flash Report published from JMA earthquake information reporting maximum observed intensity of Shindo 4.
Sources
- Japan Meteorological Agency (JMA)
- Global Disaster Alert and Coordination System (GDACS)
CrisisMap presents source-labelled information and is not the original authority for these measurements.