Earth Observatory Blog

Submitted on 26 Aug 2021 by:

In this interview series, we learn about the perspectives of the PhD students whose wide-ranging work contribute to the SEA2 Program and share what drives them in their research.

The past sea levels of the Holocene period can be reconstructed via the use of paleo-proxies, including the use of mangrove sediments, which contain organic materials that can be carbon-dated and serve as age markers and one person working on such historical records is Christabel Tan, a second-year PhD student on Professor Benjamin Horton’s research team. 

Collecting sediment core data for her thesis at Pulau Ubin, she studies and analyses their contents to help fine-tune sea-level...

Submitted on 19 Aug 2021 by:

Bangladesh, a densely populated country of over 160 million people, regularly faces climate hazards caused by flooding and typhoons. However, another natural hazard lies silently beneath the country: active tectonic faults. The fault system below Bangladesh is estimated to be able to generate an earthquake of magnitude 8.5 or greater – a phenomenally dangerous possibility, given that it lies only a few kilometres below the surface. Such an earthquake would also trigger secondary hazards: liquefaction, flooding, and possibly even abrupt shifts in the course of rivers. Despite its extreme hazard, this fault system remains poorly understood.

Bangladesh sits on the eastern border of the collision zone between India and Eurasia, where the Indian plate is subducting eastward...

Submitted on 13 Jul 2021 by:

In a world largely driven by technology, the Global Positioning System (GPS) is ubiquitous. Best known for providing positioning, navigation, and timing services, the incorporation of this system into smartphones and smartwatches has made it almost indispensable for many.

Scientists at the Earth Observatory of Singapore (EOS) have explored the use of this system for climate research by observing the amount of water vapour in the atmosphere. Atmospheric water vapour, albeit invisible, plays a crucial role in shaping the Earth’s weather and climate.

GPS radio signals travel from GPS satellites at an altitude of ~20,000 kilometres to ground receivers through the Earth’s atmosphere. Because of its physical properties, the atmosphere slows and bends the GPS signals. As...

Submitted on 15 Jun 2021 by:

In April 1991, the authorities in the Philippines began evacuating people from their homes located within 30 kilometres (km) of Mount Pinatubo. More than 60,000 people were evacuated by early June 1991. This huge undertaking came after recommendations from the Philippine Institute of Volcanology and Seismology (PHIVOLCS), and the US Geological Survey (USGS). 

Pinatubo had not recorded any eruption in the past 500 years, yet just a few days after the evacuations, the first explosive eruptions of the volcano in centuries took place.

On 12 June gas-charged magma reached the surface of Pinatubo, creating a series of explosions that formed spectacular...

Submitted on 08 Jun 2021 by:

Did you know that the coral reefs of Southeast Asia account for a third of the world total? Spanning an area of 100,000 km2, these reefs are rich in biodiversity and provide critical services to coastal communities, including fisheries, tourism, and coastal protection. 

While reef health and resilience are often measured by metrics such as the amount of coral on a reef or the number of different species, the quality of the coral skeleton itself is also a critical part of the services reefs provide. In Singapore, we found that some coral skeletons deformed and fractured more easily than their counterparts from other reefs, which may make them more vulnerable to climate change.

As corals grow, they deposit calcium carbonate crystals underneath their tissue, building...

Submitted on 21 Apr 2021 by:

Visitors to the Earth Observatory of Singapore (EOS) will be familiar with the exhibition of polar and tropical marine wildlife by some of the world’s leading photographers.

The driving force behind the ‘Elysium Epic Trilogy’ exhibition is Mr Michael Aw, the entrepreneurial underwater photographer who organised three expeditions to the Arctic, Antarctic, and Coral Triangle to document the species featured in this unique exhibition.

The locations of three disparate Elysium expeditions share one common feature – they are all in the front line of climate change. Of his experiences in the Antarctic, the Arctic, and the Coral Triangle, Michael set the scene: “It is humbling and challenging because we can see what we will lose and how much or how little we can do about...

Submitted on 18 Mar 2021 by:

Singapore is known as one of the safest places in the world. Why, then, would we choose Singapore as a case study for developing new methods for disaster risk reduction?

People tend to be surprised when a natural hazard occurs and shocked when disastrous impacts follow. We wanted to create a new framework that can help preempt such surprise. We developed a guided process to explore potential outcomes that we do not naturally want to consider due to our optimistic human nature. And, regarded as one of the world’s safest countries, where could be a more surprising location for a disaster to happen other than Singapore?

First, we needed to better quantify and understand the past disasters Singapore has experienced. We started by looking into the past records of...

Submitted on 04 Feb 2021 by:

Some are round, some are elongated, and their colours vary from off-white to shades of grey, but they all come from the seafloor of Singapore dating back to 10,000 years ago. Tiny shells, remnants of long-dead organisms, were carefully picked and arranged to compose beautiful award-winning photographs. 

Ms Yu Ting Yan, a PhD candidate working with the Coastal Lab from the Earth Observatory of Singapore (EOS), was recently recognised for two beautiful photographs featuring microscopic shells from Singapore.

Her image of a perfect heart-shaped assemblage of shells was selected as a winner of the 2020/21 Microfossil Image Competition organised by The...

Submitted on 21 Dec 2020 by:

In conversation with Dr Karen Lythgoe, Research Fellow at the Earth Observatory of Singapore

 

1. What area of earth science do you study and monitor?

I am a seismologist at the Earth Observatory of Singapore at Nanyang Technological University, where I monitor and study earthquake hazards and sub-surface imaging both for the deep and the shallow earth. I apply seismology to important Earth science problems, including earthquake processes, Earth structure and dynamics, and smart city development.

2. What opportunities exist to capture heat from the deep earth to create low carbon energy and reduce the emission of greenhouse gases?

Recently there was ...

Submitted on 01 Dec 2020 by:

The activity of Ili Lewotolok (or Lewotolo) volcano ramped up on 29 November 2020 with a series of eruptions. The largest of these eruptions occurred at about 9:45am local/Singapore time (1:45am UTC) and sent a gas and ash plume more than 5 kilometres (km) into the atmosphere. This powerful eruption was recorded by the infrasound network from the Earth Observatory of Singapore (EOS).

Scientists from EOS use infrasound sensors to remotely characterise volcanic eruptions. Even if Ili Lewotolok volcano is about 2,500 km away from Singapore, the eruption on 29 November produced a clear infrasound signal on the Singapore Infrasound Array. The same...

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