Philippines earthquakes

M4.6 earthquake 121 km N of Basco, Philippines

A magnitude 4.6 earthquake struck 121 km N of Basco, Philippines on Mon, Jul 24, 1978, 1:30 AM GMT+8 (17:30 UTC), 33 km (21 mi) below the surface.

A larger quake followed: M5.2 74 km E of Hengchun, Taiwan. This one was a foreshock.

Hengchun forecastMore in Philippines

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
4.6 (mb), light
Local time
UTC
1978-07-23 17:30:37 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
21.536° N, 121.821° E
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Depth from
OPERATOR_ASSIGNED
Stations used
8

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.6 and up: 19 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 4.3105 km E of Hengchun, Taiwan · 17592 days ago · 33 km deep · 35 km away
  2. 4.1112 km ESE of Hengchun, Taiwan · 17592 days ago · 33 km deep · 24 km away
  3. 4.4Taiwan region · 17592 days ago · 24 km deep · 94 km away
  4. 5.274 km E of Hengchun, Taiwan · 17592 days ago · 33 km deep · 59 km away
  5. 5.589 km ENE of Hengchun, Taiwan · 17592 days ago · 30 km deep · 83 km away
  6. 4.045 km ESE of Hengchun, Taiwan · 17591 days ago · 33 km deep · 78 km away
  7. 5.4Taiwan region · 17591 days ago · 18 km deep · 78 km away
  8. 4.570 km E of Hengchun, Taiwan · 17591 days ago · 33 km deep · 58 km away
  9. 4.570 km E of Hengchun, Taiwan · 17591 days ago · 10 km deep · 73 km away
  10. 4.464 km ESE of Hengchun, Taiwan · 17590 days ago · 32 km deep · 59 km away
  11. 4.759 km ENE of Hengchun, Taiwan · 17590 days ago · 24 km deep · 91 km away
  12. 3.966 km E of Hengchun, Taiwan · 17590 days ago · 10 km deep · 80 km away
  13. 4.564 km ESE of Hengchun, Taiwan · 17589 days ago · 10 km deep · 61 km away
  14. 4.3100 km E of Hengchun, Taiwan · 17584 days ago · 10 km deep · 62 km away
  15. 4.773 km ENE of Hengchun, Taiwan · 17578 days ago · 15 km deep · 80 km away
  16. 5.483 km ENE of Hengchun, Taiwan · 17572 days ago · 19 km deep · 83 km away
  17. 5.279 km E of Hengchun, Taiwan · 17559 days ago · 10 km deep · 65 km away
  18. 4.294 km ENE of Hengchun, Taiwan · 17553 days ago · 10 km deep · 89 km away
  19. 3.767 km E of Hengchun, Taiwan · 17535 days ago · 10 km deep · 66 km away

Before

  1. 5.179 km E of Hengchun, Taiwan · 17592 days ago · 17 km deep · 55 km away
  2. 4.874 km E of Hengchun, Taiwan · 17592 days ago · 33 km deep · 62 km away
  3. 5.075 km ENE of Hengchun, Taiwan · 17592 days ago · 26 km deep · 94 km away
  4. 5.167 km ENE of Hengchun, Taiwan · 17592 days ago · 19 km deep · 99 km away
  5. 7.485 km ENE of Hengchun, Taiwan · 17592 days ago · 17 km deep · 89 km away
  6. 4.198 km ESE of Hengchun, Taiwan · 17614 days ago · 42 km deep · 26 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp0000vqa. Read Mon, Sep 21, 2026, 11:28 PM UTC.