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Tsunami Events
CDIP's pressure sensors have recorded a number of tsunamis in Pacific
waters. Data from these events are shared with the
West Coast and Alaska Tsunami Warning Center
and other institutions to help with their research efforts.
For a brief description of tsunamis and their measurement,
please refer to the
Wave Measurement section of our documentation.
September 2009 Samoa Islands earthquake and tsunami
At 17:48 UTC on September 29, 2009 an earthquake of magnitude 8.0 occurred
south of Samoa, centered at 15.509° S, 172.034° W.
A tsunami was generated which was recorded
throughout the Pacific Ocean. CDIP's Scripps Pier pressure sensor
picked up the tsunami signal; it arrived at Scripps at approximately
05:00 UTC on September 30.
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The Samoa plot has three graphs, all of which cover 10 hours
starting at 02:00 UTC on Sept 30th. The first graph shows 1-minute
average readings straight from the sensor (which samples at 1 Hz),
and the second shows 2-minute averages. The third and final plot
shows 1-minute average readings which have been de-tided. The tide
was removed by performing a linear detrend on 60-minute segments
of the time series.
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Samoa plot
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November 2006 Kuril Islands earthquake and tsunami
At 11:14 UTC on November 15, 2006 an earthquake of magnitude 8.3 occurred in
the Kuril Islands, centered at 46.577° N, 153.247° E.
A mild, low-amplitude tsunami was generated which was recorded
throughout the Pacific Ocean. CDIP's Scripps Pier pressure sensor
picked up the tsunami signal; it arrived at Scripps at approximately
20:50 UTC on November 15.
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The Kuril plot has three graphs, all of which cover 8 hours
starting at 19:00 UTC on Nov 15th. The first graph shows 1-minute
average readings straight from the sensor (which samples at 1 Hz),
and the second shows 2-minute averages. The third and final plot
shows 2-minute average readings which have been de-tided. The tide
was removed by performing a linear detrend on 60-minute segments
of the time series.
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Kuril plot
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May 2006 Tonga earthquake and tsunami
At 15:27 UTC on May 3, 2006 an earthquake of magnitude 7.8 occurred in
the South Pacific, centered at 20.03 S, 174.23 W in the Tonga Islands.
A very mild, low-amplitude tsunami was generated which was recorded
throughout the Pacific Ocean. CDIP's Scripps Pier pressure sensor
picked up the tsunami signal; it arrived at Scripps at approximately
02:40 UTC on May 4.
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The Tonga plot has three graphs, all of which cover 8 hours
starting at 00:00 UTC on May 4th. The first graph shows 1-minute
average readings straight from the sensor (which samples at 1 Hz),
and the second shows 5-minute averages. The third and final plot
shows 1-minute average readings which have been de-tided. The tide
was removed by performing a linear detrend on 60-minute segments
of the time series.
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Tonga plot
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December 2004 Sumatra earthquake and tsunami
The earthquake occurred at 00:59 UTC on December 26th west of Aceh,
Indonesia. It measured 9.0 on the Richter scale, centered at 3.3 S
latitude, 95.8 E longitude. (Details of the event's seismology are
available from
Project IDA.)
Although the earthquake and resulting tsunami were generated in the
Indian Ocean, the event was of such magnitude that it produced tsunami
effects across the globe. These effects were recorded by CDIP sensors
in the Pacific at Scripps Pier, California.
A pressure sensor measuring water column height was in use at
Scripps Pier (Station 073) at the time of the event.
For details of the sensor's location and configuration, check the
data descriptions below.
(More information regarding this event is available through the
WC/ATWC.)
| Sensor/time series descriptions: |
073
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| 1-Hz time series (df) data, 12/26 - 12/31/2004: |
073
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| Spectral (sp) data, 12/26 - 12/31/2004: |
073
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| View full station details and data: |
073
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Water column plots
These plots show the average sensor readings over periods
of 2, 5, and 10 minutes; the tsunami signal can be seen
atop the tidal movements.
Station 073 averages:
2-minute
5-minute
10-minute
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Tsunami signal plots
These plots show the signal from the tsunami, with
tides and other components removed from the sensors'
readings.
Station 073
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October 1994 Shikotan earthquake and tsunami
The earthquake occurred at 13:23 UTC on October 4 northeast of Hokkaido,
Japan. The earthquake measured 8.5 on the Richter scale and its
epicenter was at 42.9 N latitude, 147.2 E longitude.
CDIP sensors at Kahalui Harbor, Hawaii recorded the resulting tsunami.
View full station details and data:
077
079
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