Dates of Images:

Displacement Maps:1/15/2020 - 1/13/2021; 1/13/2021 - 1/27/2021

Amplitude Maps: 1/15/2020, 1/13/2021, 1/27/2021

Date of Next Image:

Unknown

Summary:

Scientists at NASA's Goddard Space Flight Center (GSFC) and the Advanced Rapid Imaging and Analysis (ARIA) team at NASA's Jet Propulsion Laboratory created these displacement maps with synthetic aperture radar interferometry method, over the summit of La Soufriere Volcano on St. Vincent and the Grenadines. The team produced the displacement maps to monitor surface changes regarding the volcanic activity. From the interferogram, 01/15/2020-01/13/2021, approximately 8-9cm of surface deformation in the radar line-of-sight direction over the summit. However, it may contain the signal by the tropospheric delay. Also, the shadow effect induced by the radar geometry and steep caldera wall is a major obstacle to measure the ground displacements of the newly developed dome inside the caldera.

The amplitude images from 01/15/2020 to 01/27/2021 is showing the dome growth inside the caldera nicely. The Copernicus 30 meter dataset (GLO-30) has been interpolated to 15 meter distance and used for georeferencing and terrain correction.

The maps were derived from synthetic aperture radar (SAR) data acquired on 1/15/2020, 1/13/2021, and 1/27/2021 by JAXA's ALOS-2 PALSAR-2 sensor. The original resolution of these acquisitions is about 10 meters and coverage is about 70 by 70 km at L-band.

Suggested Use:

Areas in red are surface displacement up and to the west. Areas in blue are down and to the east.

This displacement map should be used as guidance to identify areas of ground displacements, and may be less reliable over heavily vegetated areas and steeper slopes. This displacement may have voids over heavily vegetated areas and steeper slopes.

The amplitude maps can be used to identify changes around the caldera and lava dome that can be seen in the displacement maps.

Satellite/Sensor:

Japan Aerospace Exploration Agency (JAXA) ALOS-2 PALSAR-2, Stripmap Mode (SM3)

Resolution:

Displacement Maps: 30 meters

Amplitude Maps: 15 meters

Credits:

The ALOS-2 data products are processed from original data products copyright (2021) by the Japan Aerospace Exploration Agency (JAXA), and were provided under JAXA ALOS EO-RA2 project. Analyzed by NASA-Goddard Space Flight Center and NASA-JPL/Caltech ARIA team.

Esri REST Endpoint:

See URL Section on right side of page

WMS Endpoint:

Data Download:

https://maps.disasters.nasa.gov/download/gis_products/event_specific/2021/la_soufriere_eruption/alos2/