A Better Tsunami Warning System?

 Research vessel Kilo Moana: NOAA

Research vessel Kilo Moana: NOAA

A new paper in Geophysical Research Letters outlines a better and cheaper way to detect and track tsunamis based on equipping ships in the commercial fleet with real-time-streamed GPS (Global Positioning System). 

Current tsunami detection systems primarily consist of seismic stations and tide-gauges on land, the DART buoy sea-floor pressure sensor system in the deep ocean (now only partially deployed globally and frequently inoperative), and real-time, land-based GPS networks. But what’s needed to really save lives is GPS deployed on deep ocean platforms. The authors write:

A… broadly applicable deep-water GPS-buoy system… like the existing DART network, would be extremely costly to build and maintain, limiting the number of units that could be deployed, and thus requiring careful site selection based on our best estimate of the hazard… We suggest that the commercial shipping fleet, in contrast, represents a vast existing infrastructure with excellent spatial coverage across most of the globe that could be exploited to construct an extremely cost-effective tsunami detection network in the deep oceans.

 

Position of R/V Kilo Moana during 2010 Chile tsunami: James H. Foster, et al. GRL. 2012. DOI:10.1029/2012GL051367Position of R/V Kilo Moana during 2010 Chile tsunami: James H. Foster, et al. GRL. 2012. DOI:10.1029/2012GL051367

The authors got a chance to test the feasability of this approach when the M8.8 earthquake struck Chile in February 2010. At the time the University of Hawaii research vessel Kilo Moana (photo above) was underway on a passage from Hawaii to Guam (map above), cruising at 11 knots of speed and logging data from its dual onboard GPS. These recorded a modest ~ 4-inch-high wave (~10 centimeters)—the first ever shipboard detection of a tsunami. 

As for how to scale up from one ship to a network of tsunami-sensing ships, the authors suggest a template already exists in the Voluntary Observing Ship (VOS) Scheme, which trains merchant sailors to take weather observations at sea. The authors write:

It is estimated that 11% of the commercial fleet is contributing to the VOS scheme… VOS reports indicate that the north Pacific shipping lanes between Asia and N. America have, on average, more than 350 VOS ships crossing the dateline on any given day. Assuming an average transit of ten days, if each of the currently cooperating ships could be upgraded to provide GPS data streams we could expect at least 3,500 new tsunami sensing systems just in the N. Pacific.

 

 2004 Indian Ocean tsunami in Tahiland: David Rydevik via Wikimedia Commons

2004 Indian Ocean tsunami in Thailand: David Rydevik via Wikimedia Commons

The authors also calculate that a ship-based detection system would have detected in less than an hour the 2004 Indian Ocean tsunami, which, undetected, killed upwards of 230,000 people in 14 countries.

The paper:

  • Foster, J. H., B. A. Brooks, D. Wang, G. S. Carter, and M. A. Merrifield (2012), Improving tsunami warning using commercial ships, Geophys. Res. Lett., 39, L09603, doi:10.1029/2012GL051367.

 

A BETTER WAY TO DO THIS?

We have an ambitious $350,000 online fundraising goal this month and we can't afford to come up short. But when a reader recently asked how being a nonprofit makes Mother Jones different from other news organizations, we realized we needed to lay this out better: Because "in absolutely every way" is essentially the answer.

So we tried to explain why your year-end donations are so essential, and we'd like your help refining our pitch about what make Mother Jones valuable and worth reading to you.

We'd also like your support of our journalism with a year-end donation if you can right now—all online gifts will be doubled until we hit our $350,000 goal thanks to an incredibly generous donor's matching gift pledge.

payment methods

A BETTER WAY TO DO THIS?

We have an ambitious $350,000 online fundraising goal this month and we can't afford to come up short. But when a reader recently asked how being a nonprofit makes Mother Jones different from other news organizations, we realized we needed to lay this out better: Because "in absolutely every way" is essentially the answer.

So we tried to explain why your year-end donations are so essential, and we'd like your help refining our pitch about what make Mother Jones valuable and worth reading to you.

We'd also like your support of our journalism with a year-end donation if you can right now—all online gifts will be doubled until we hit our $350,000 goal thanks to an incredibly generous donor's matching gift pledge.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate