Surface velocity map of the Afar Rift Zone from 2014-19
This dataset contains a map of ground movements covering the Afar Rift Zone in Ethiopia, Eritrea, and Djibouti for the time period between October 2014 and August 2019. The Afar region is located where three tectonic plates are pulling apart, creating rift segments which are 50-100 km long. Surface deformation on these segments is not constant in time, with episodes of rifting occurring periodically and magma intrusions causing sudden ground movements. We use frequent Sentinel-1 satellite Interferometric Synthetic Aperture Radar (InSAR) observations to measure surface displacements through time across the whole region. We relate these to ground based Global Navigation Satellite Systems (GNSS) observations and combine data from different satellite tracks to produce maps of the average surface velocity in three directions (perpendicular to the rift zone, parallel to the rift zone, and vertical). The continued observation of these time-varying ground movements is important for understanding how continents break up, with data here providing evidence of how tightly focussed extension is around the rift segments and of the subsurface magma movement at several volcanic centres.
Simple
- Date (Publication)
- 2021-09-29T09:40:39
- Date (Creation)
- 2021-09-29T09:40:39
- Identifier
- NERC EDS Centre for Environmental Data Analysis / ac43cee2bf5e4942970492209ba95e49
- Identifier
- doi / 10.5285/ac43cee2bf5e4942970492209ba95e49
Custodian
NERC EDS Centre for Environmental Data Analysis
-
custodian
RAL Space
,
STFC Rutherford Appleton Laboratory, Harwell Campus
,
Didcot
,
OX11 0QX
,
United Kingdom
01235446432
Distributor
NERC EDS Centre for Environmental Data Analysis
-
distributor
RAL Space
,
STFC Rutherford Appleton Laboratory, Harwell Campus
,
Didcot
,
OX11 0QX
,
United Kingdom
01235446432
pointofContact
NERC EDS Centre for Environmental Data Analysis
-
point_of_contact
RAL Space
,
STFC Rutherford Appleton Laboratory, Harwell Campus
,
Didcot
,
OX11 0QX
,
United Kingdom
01235446432
Publisher
NERC EDS Centre for Environmental Data Analysis
-
publisher
RAL Space
,
STFC Rutherford Appleton Laboratory, Harwell Campus
,
Didcot
,
OX11 0QX
,
United Kingdom
01235446432
- Maintenance and update frequency
- Unknown
- Update scope
- Dataset
- Keywords
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- Sentinel-1
- InSAR
- GNSS
- velocity
- map
- GEMET - INSPIRE themes, version 1.0
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- orthoimagery
- Access constraints
- Other restrictions
- Other constraints
- Public data: access to these data is available to both registered and non-registered users.
- Use constraints
- Other restrictions
- Spatial representation type
- Grid
- Metadata language
- English
- Topic category
-
- Imagery base maps earth cover
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- Begin date
- 2014-10-11T00:00:00
- End date
- 2019-08-17T23:59:59
- Unique resource identifier
- WGS 84
- Distribution format
-
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Data are netCDF formatted.
()
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Data are netCDF formatted.
()
Distributor
NERC EDS Centre for Environmental Data Analysis
-
Data Center Contact
RAL Space
,
STFC Rutherford Appleton Laboratory, Harwell Campus
,
Didcot
,
OX11 0QX
,
United Kingdom
01235446432
- OnLine resource
-
CEDA Data Catalogue Page
Detail and access information for the resource
- OnLine resource
-
DOWNLOAD
Download Data
- OnLine resource
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Related paper: Rift Focussing and Magmatism During Late-Stage Rifting in Afar C. Moore,T. J. Wright,A. Hooper, 2021
No further details.
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Statement
- Sentinel-1 Single Look Complex (SLC) data were sourced from the European Space Agency (ESA) Copernicus Hub, and processed using LiCSAR software (Lazecky et al., 2020). Processing and analysis was then performed by the authors (University of Leeds, COMET) in MATLAB to account for atmospheric effects, estimate uncertainties, create deformation time series and average velocity maps, reference surface velocities to the regional GNSS network (King et al., 2019), and convert velocities from the satellite look direction into rift-perpendicular and rift-parallel horizontal and vertical components. Final velocity maps and variance estimates were exported to NetCDF format for archiving. Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).
- File identifier
- ac43cee2bf5e4942970492209ba95e49 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2024-11-21T00:30:52
- Metadata standard name
- UK GEMINI
- Metadata standard version
- 2.3
Point of contact
NERC EDS Centre for Environmental Data Analysis
RAL Space
,
STFC Rutherford Appleton Laboratory, Harwell Campus
,
Didcot
,
OX11 0QX
,
United Kingdom
01235446432
Overviews
Spatial extent
N
S
E
W
Provided by
Associated resources
Not available