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GRACE Sees Earthquake in Indian Ocean

The signal of the December 2004 earthquake in the Indian Ocean in GRACE observations of Earth's gravity field.

The signal of the December 2004 earthquake in the Indian Ocean in GRACE observations of Earth's gravity field. 

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NASA/JPL/University of Texas-CSR

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Gravity anomaly map using GRACE data.
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Gravity anomaly map using GRACE data.
Gravity Anomaly Map Using GRACE Data
The force of gravity not only keeps us from floating away, it also lets NASA study Earth’s water and ice from space. Using a pair of twin satellites named GRACE, we can monitor our planet’s water.
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The force of gravity not only keeps us from floating away, it also lets NASA study Earth’s water and ice from space. Using a pair of twin satellites named "GRACE," we can monitor where our planet’s water is going, even when it is underground.
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This map from September 2015 shows deep drought in California, Nevada and Texas. 
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While the GRACE mission was active, scientists at NASA’s Goddard Space Flight Center generated groundwater and soil moisture drought indicators like this every week from GRACE data on terrestrial water storage and other observations, using a numerical model of land surface water and energy processes.
Groundwater Drought Indicator
The twin satellites of NASA's Gravity Recovery and Climate Experiment Follow-on, or GRACE-FO, will track the movement of water around Earth. This short video explains how and why it's important.
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Explaining why GRACE-FO is so important.
Why Is GRACE-FO So Important?
The GRACE mission launched in 2002, changing our understanding of Earth.
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The GRACE mission launched in 2002, changing our understanding of Earth.
15 Years of GRACE
NASA’s Gravity Recovery and Climate Experiment (GRACE) has measured significant groundwater depletion around the world in recent years. 
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GRACE data over the United States, 2003-2012
GRACE Sees Groundwater Losses Around the World
Between 2002 and 2016, Antarctica shed approximately 125 gigatons of ice per year, causing global sea level to rise by 0.35 millimeters per year.
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Between 2002 and 2016, Antarctica shed approximately 125 gigatons of ice per year, causing global sea level to rise by 0.35 millimeters per year.
Antarctic Ice Loss 2002-2016
Variations in water storage in the Tigris and Euphrates river basins from 2003 to 2009, measured by GRACE. Reds represent drier conditions, while blues represent wetter conditions. The majority of ...
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Variations in water storage in the Tigris and Euphrates river basins from 2003 to 2009, measured by GRACE. Reds represent drier conditions, while blues represent wetter conditions. The majority of the water lost was due to reductions in groundwater caused by human activities.
Tigris and Euphrates Water Storage, 2003 to 2009
A simplified example of how the distance between the GRACE-FO satellites changes as they pass from the Caribbean Sea across Colombia and Peru.
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A simplified example of how the distance between the GRACE-FO satellites changes as they pass from the Caribbean Sea across Colombia and Peru (which have higher mass than the oceans) to the Pacific Ocean. Panel 1: When both spacecraft are over the ocean, the distance between them is relatively constant.
How GRACE-FO Measures Gravity
An animation showing “sea level fingerprints,” or patterns of rising and falling sea levels across the globe in response to changes in Earth’s gravitational and rotational fields. 
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An animation showing “sea level fingerprints,” or patterns of rising and falling sea levels across the globe in response to changes in Earth’s gravitational and rotational fields.
Cumulative Sea Level Change 2002-2015
Illustration of GRACE-FO gravity data over Africa.
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Illustration of GRACE-FO gravity data over Africa.
GRACE-FO Gravity Data Over Africa
Changes in Australia's mass observed by GRACE in 2010 and 2011. Areas in greens and blues had the greatest increases in mass, caused by unusually high precipitation connected with a large La Niña e...
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Changes in Australia's mass observed by GRACE in 2010 and 2011. Areas in greens and blues had the greatest increases in mass, caused by unusually high precipitation connected with a large La Niña event.
Changes in Australia's Mass Observed by GRACE in 2010 and 2011
GRACE Rendering  
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GRACE Rendering
GRACE Rendering
Monthly changes in ocean bottom pressure data obtained by the GRACE satellites from November 2002 to January 2012. 
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Monthly changes in ocean bottom pressure data obtained by the GRACE satellites from November 2002 to January 2012.
Ocean Bottom Pressure 2002-2012
Changes in total water storage on Earth in 2007, as measured by GRACE.
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Water storage on Earth in 2007
Water Storage on Earth in 2007
For 15 years, the GRACE mission has unlocked mysteries of how water moves around our planet. It gave us the first view of underground aquifers from space, and shows how fast polar ice sheets and mo...
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For 15 years, the GRACE mission has unlocked mysteries of how water moves around our planet. It gave us the first view of underground aquifers from space, and shows how fast polar ice sheets and mountain glaciers are melting.
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The rainy and dry seasons in the Amazon Basin in 2004, revealed by gravity anomalies observed by GRACE. Reds and pinks show where and when mass was higher than average, a sign that more water was p...
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The rainy and dry seasons in the Amazon Basin in 2004, revealed by gravity anomalies observed by GRACE. Reds and pinks show where and when mass was higher than average, a sign that more water was present, and blues show months when mass was lower.
Rainy and Dry Seasons in the Amazon (2004)
NASA JPL-UC Irvine glaciologist Eric Rignot explains how glaciers in West Antarctica are changing. 
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NASA JPL-UC Irvine glaciologist Eric Rignot explains how glaciers in West Antarctica are changing.
West Antarctic Collapse
The GRACE-FO satellites are nearly identical. The Microwave Interferometer (MWI) will measure the minute variations in distance between the spacecraft.
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The GRACE-FO satellites are nearly identical. The Microwave Interferometer (MWI) will measure the minute variations in distance between the spacecraft.
GRACE-FO Instruments
GRACE-Follow On (GRACE-FO) is a satellite mission that launched in May 2018. GRACE-FO will continue the work of the GRACE satellite mission tracking Earth's water movement around the globe. These d...
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Video for the GRACE-FO mission.
Tracking Water from Space
Many of today’s most pressing climate science challenges hinge on knowing how and where water is moving on Earth. GRACE-FO will continue the successful partnership between NASA and the German Resea...
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Image of the spacecraft in orbit over Earth, with the black of space.
GRACE-FO Launch Press Kit
GRACE observed Earth’s surface mass changes nearly every month from 2002 to mid-2017. GRACE Follow-On will provide crucial continuity to these observations for the next five years or more.
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GRACE observed Earth’s surface mass changes nearly every month from 2002 to mid-2017. GRACE Follow-On will provide crucial continuity to these observations for the next five years or more.
Earth Mass Changes, 2002 to 2017
Visualization of the mass change over Greenland from January 2004 through June 2014. 
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Mass changes in Greenland.
GRACE Mission Measures Global Ice Mass Changes
GRACE-FO will measure Atlantic Ocean bottom pressure as an indicator of deep ocean current speed, as GRACE did. 
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GRACE-FO will measure Atlantic Ocean bottom pressure as an indicator of deep ocean current speed, as GRACE did. This pattern of above-average (blue) and below-average (red) seafloor pressure in 2009 GRACE data revealed a temporary slowing of deep ocean currents.
Ocean Bottom Pressure
Depletion of groundwater in northwestern India between 2002 and 2008, measured by GRACE.
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Depletion of groundwater in northwestern India between 2002 and 2008, measured by GRACE.
Groundwater Depletion in India, 2002-2008

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