May 3, 1998 Tsunami: Southeast of, Taiwan
A tsunami caused by a magnitude 7.5 earthquake began at Southeast of, Taiwan on May 3, 1998 at 23:30:21 UTC. The water rose as high as 0.13 meters. Its effects were recorded at 15 places in at least 2 countries.
Where the waves reached
The source (white) and every runup with a place, colored by the water height recorded there. A ring is a runup NCEI marks doubtful.
- Under 1 m
- 1 to 3 m
- 3 to 10 m
- 10 to 30 m
- 30 m and more
- Height not recorded
Travel times
How long the first wave took to reach each part of the ocean, one line for each hour up to 24, estimated from the source and the depth of the sea.
The travel times are computed in your browser, which needs JavaScript.
- 1 to 4 hours
- 5 to 6 hours
- 7 to 14 hours
- 15 hours and more
Computed in your browser the way NOAA’s own travel time maps are: the wave travels at the square root of gravity times the depth, over NOAA’s ETOPO1 depths averaged to a 10 arc-minute grid. Checked against NOAA NCEI’s maps for 21 tsunamis over the first 24 hours, these lines fall within 10 minutes of NCEI’s at half the points compared and within 52 minutes at 9 in 10. They give when the first wave could arrive, not how high it is; bays, harbors and island chains finer than the grid can see it later. Not for use in a warning: see tsunami.gov.
The tsunami
- Date
- May 3, 1998, 23:30:21 UTC
- Source
- Southeast of, Taiwan
- Cause
- Earthquake
- Earthquake
- Magnitude 7.5, 33 km deep
- Maximum water height
- 0.13 m (0.4 ft)
- Runups recorded
- 15
- Warning
- Local Tsunami Warning issued by a regional or national warning center
- Waters
- Ocean
- How certain
- Definite tsunami
- Source location
- 22.306° N, 125.308° E
The toll
The record gives no deaths, injuries or damage for this tsunami.
What the record says
NCEI’s account, from the sources it cites.
Tsunami Warning was issued in some regions judging from the shallow focal depth and the large magnitude. This included a warning for the Coasts of Okinawa Islands, which went into effect at 23:39 UTC. A watch was put into affect for Kyushu coastlines (23:50 UTC) and for the Pacific Coast of Central Honshu and Shikoku (23:51 UTC). A small tsunami was observed. The fault was revealed to be a strike-slip. The all-clear for all areas was given at 2:15 UTC. (reference #2673)
Minor local tsunami generated with recorded wave heights of 4 cm on Miyako-shima and 3 cm on Ishigaki-shima and at Naha, Okinawa. (reference #1053)
Every runup
Nearest the source first. Heights are above sea level at the time; a tide gauge reads half the wave’s full height.
| Where | Country | Km from source | Water height, m | Inland, m | Measured by | First wave, UTC | Deaths |
|---|---|---|---|---|---|---|---|
| Ishigakiko | Japan | 254 | 0.03 | Tide gauge (half the maximum wave height) | day 4, 00:02 | ||
| Miyako Island | Japan | 275 | 0.04 | Tide gauge (half the maximum wave height) | day 4, 00:36 | ||
| Yonaguni | Japan | 338 | 0.02 | Tide gauge (half the maximum wave height) | |||
| Lanyu | Taiwan | 393 | 0.07 | Tide gauge (half the maximum wave height) | |||
| Naha | Japan | 495 | 0.03 | Tide gauge (half the maximum wave height) | day 3, 00:34 | ||
| Amami | Japan | 790 | 0.04 | Tide gauge (half the maximum wave height) | |||
| Naze | Japan | 794 | 0.04 | Tide gauge (half the maximum wave height) | |||
| Makurazaki | Japan | 1,110 | 0.05 | Tide gauge (half the maximum wave height) | day 3, 02:12 | ||
| Aburatsu | Japan | 1,193 | 0.05 | Tide gauge (half the maximum wave height) | day 3, 02:23 | ||
| Tosa-Shimizu | Japan | 1,384 | 0.06 | Tide gauge (half the maximum wave height) | day 3, 02:33 | ||
| Murotomisaki | Japan | 1,494 | 0.05 | Tide gauge (half the maximum wave height) | day 3, 02:15 | ||
| Miyake Island | Japan | 1,903 | 0.11 | Tide gauge (half the maximum wave height) | day 3, 03:12 | ||
| Okada | Japan | 1,948 | 0.11 | Tide gauge (half the maximum wave height) | day 3, 03:37 | ||
| Mera | Japan | 1,988 | 0.13 | Tide gauge (half the maximum wave height) | day 4, 03:37 | ||
| Mera | Japan | 1,988 | 0.13 | Tide gauge (half the maximum wave height) |
More
Every tsunami in 1998The 1900sTsunamis of TaiwanThe earthquakeThis day in weather historyAlerts in force
Sources
Tsunami events and runups from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI tsunami event 2280.