Global Reef Expedition

The largest natural explosion in a century

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Today we’re interviewing our Chief Scientist, Dr. Sam Purkis, about his latest research paper, which measured the size of the 2022 eruption of a submarine volcano in Tonga and the resulting tsunami.

Published in this month’s issue of Science Advances, the study found that the volcanic explosion in Tonga was the largest natural explosion in more than a century. The explosion was so large that it produced a tsunami that at one point was as tall as a 20 story building, and was similar in size to explosion of Krakatoa in 1883.

Q: What led you to do this research on the tsunami that hit Tonga last year?
A: It was the event itself that led us to start this study. We began work…

Measuring the size of a Tsunami

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How big was the size of the tsunami that hit Tonga last year? A new study led by scientists at the University of Miami and the Khaled bin Sultan Living Oceans Foundation measured the size of the Tongan tsunami and found that it was similar in size to the one caused by the eruption of Krakatoa in 1883.

The 2022 eruption of a submarine volcano in Tonga was more powerful than the largest U.S. nuclear explosion, according to a new study led by scientists at the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science and the Khaled bin Sultan Living Oceans Foundation.  

The 15-megaton volcanic explosion from Hunga Tonga-Hunga Ha’apai, one of the largest natural explosions in more than a century, generated a mega-tsunami with waves up to 45-meters high (148 feet) along the coast of Tonga’s Tofua Island and waves up to 17 meters (56 feet) on Tongatapu, the country’s most populated island.

In a new analysis in Science Advances, researchers used a combination of before-and-after satellite imagery, drone mapping, field observations collected by scientists at The University of Auckland, and high-resolution bathymetric maps from the Khaled bin Sultan Living Oceans Foundation’s Global Reef Expedition, to produce a tsunami simulation of the Tongan Archipelago. The results showed how the complex shallow bathymetry in the region acted as a low-velocity wave trap, capturing a more than hour-long tsunami with waves up to 85 meters (279 feet) high one minute after the initial explosion.

Measuring reef health from space

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With compelling evidence that we have lost half of the world’s tropical coral reefs over the last few decades, there is an urgent need to understand their overall health. Without this basic information to use as a baseline, it is near impossible to mount a response to the so-called global reef crisis. The most straightforward method we have for monitoring reefs is conducting SCUBA diver surveys. However, this type of field work is logistically and financially challenging to execute on large scales, so developing a new method to monitor reefs remotely is key.

In attempt to find a solution, Anna Bakker combines the fields of remote sensing, computer science, and ecology to measure reef health from space. Recently, Anna published a paper in Coral Reefs, which utilized the Living Oceans Foundation’s Global Reef Expedition field dataset to build a model that can predict coral cover and other metrics of coral reef health using open-source satellite data.

The Blue & Green Security Forum

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Earlier this month, H.R.H. Princess Hala bint Khaled bin Sultan spoke about the importance of marine conservation for sustainable development at The Global Diwan’s Blue & Green Security Forum in Nice, France.

This high-level event brought together business leaders, experts, and decision makers from Europe and the Middle East to tackle some of tomorrow’s most important challenges: the environment and food security. Designed to inspire a renewed dialogue between Europe and the Arab world, the Forum covered many topics related to sustainable economic and human development in the MENA region. It also highlighted women and young leaders who are committed to providing solutions.

As a Director of the Living Oceans Foundation, Princess Hala spoke eloquently about her own journey into marine conservation and the Foundation’s work to preserve healthy oceans for current and future generations. She also called upon the global community to support efforts to conserve coral reefs and other coastal marine ecosystems—before it is too late.

See what she said in her speech from the opening session…

Coral Reefs in the South Pacific: A Webinar with SPREP

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The Khaled bin Sultan Living Oceans Foundation recently hosted a webinar with our partners at the Secretariat of the Pacific Regional Environmental Programme (SPREP). SPREP is an organization established by the governments of Pacific Island nations to protect and manage the environment and natural resources of the Pacific. Their 21 member states (including many we studied on the Global Reef Expedition) work together to achieve healthy and resilient ecosystems and support sustainable development for Pacific communities. Our webinar with SPREP allowed us to share our research findings from the South Pacific directly with people who are actively working to conserve coral reefs and coastal marine ecosystems in the region. This is one of the many ways we are sharing our knowledge and findings from the Global Reef Expedition with the countries and communities in which we worked.

During the webinar, we were able to share information about the work the Foundation completed on the Expedition, including our extensive outreach and education initatives, as well as our scientific findings. We highlighted the programs our education team developed over the course of the Expedition, the many outreach events we held, and provided a comprehensive discussion of the results of our research in the South Pacific as well as our work in the Indian Ocean and Caribbean Sea.

At the end of the presentation, we were able to share our ongoing partnerships and upcoming projects, including our ongoing partnership with the University of Miami to develop a reef resilience model, our partnership with NASA to map the world’s reefs, as well as our numerous education programs such as the Mangrove Education & Restoration Program, Coral Reef Ecology Curriculum, and Science Without Borders® Challenge. Lastly, we shared information about our endorsed UN Ocean Decade Project, Science Without Borders®: Conserving the Tropics, which will use science, outreach, and education to engage local communities to protect their coral reefs, mangrove forests, and seagrass meadows. This project will allow us to build off of our work on the Global Reef Expedition using a co-designed approach to further conservation of tropical coastal marine ecosystems, such as those in the South Pacific.

The webinar was attended by numerous government officials, marine managers, and stakeholders from throughout the South Pacific. Some of the attendees were people we had worked with on the Global Reef Expedition, but many were new and this webinar was a great introduction to the Foundation and our work. There was a great Q&A session at the end where we were able to discuss the findings and share more information about future partnerships.

As we take the work from the Global Reef Expedition to the next level, we are always looking to develop new partnerships to help bring the UN endorsed Science Without Borders® project to communities worldwide. Webinars like this, and partnering with SPREP, are important first steps in the implementation of the Science Without Borders® project and connect us with a network of people who are also working to protect, conserve, and restore ocean health.

Findings from the World’s Largest Coral Reef Expedition Showcased at International Coral Reef Conference

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The Khaled bin Sultan Living Oceans Foundation is sharing its findings from the Global Reef Expedition (GRE) at the 15th  International Coral Reef Symposium (ICRS) this week in Bremen, Germany. This international coral reef conference brings together experts in coral reef …