Published May 1, 2022
| Version v1
Dataset
Open
Fault database for the George and NE Edward Rifts, Uganda
Description
This database is associated with a master's research project at the University of Bristol. The initial geospatial database documents the geometry of 152 faults identified through digital mapping, along with associated attributes. This represents the first detailed fault mapping conducted in the area. The version of record is in .geojson format, however data is also available in .kmz and .shp formats. Attributes are adapted from Williams et al. (2022) and the Global Earthquake Model Global Active Faults Database (GEM-GAFD; Styron & Pagani, 2020).
| Attribute | Data Type | Description | Notes |
|---|---|---|---|
| FAULT_ID | integer | Unique numerical reference ID | |
| CONFIDENCE | integer | Certainty of whether the fault exists there | 1 = moderate, 2 = high |
| FAULT_NAME | string | Name of fault | Not all faults are named. Assigned based on previous mapping or local geographic features. |
| DIP_DIR | string | Compass quadrant of fault dip direction | |
| NOTES | string | Remaining miscellaneous information about the fault | e.g. cross-cutting, segmentation, channel incision. |
| LENGTH_TT | integer | Tip-to-tip fault length | |
| MAX_GRAD | real number | Estimated maximum gradient of scarp | Calculated by taking fault-normal topographic profile at steepest gradient indicated by slope map. |
| LENGTH | real number | Along-trace fault length |
Fault-normal topographic profiles were then used to measure scarp heights for 130 of the 152 mapped faults. The resulting displacement-length data for each fault is documented in 'slip_profile_data.zip'. A summary of the analysis of fault slip (displacement-length) profiles is outlined in 'EGR_slip_profiles_summary.xlsx'.
| Attribute | Description | Notes | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fault ID | Unique numerical reference ID | ||||||||||
| Length | Along-trace fault length | To nearest 100m | |||||||||
| Dmax | Maximum measured displacement along fault scarp | ||||||||||
| Dmax/L | Maximum displacement divided by fault length | ||||||||||
| Profile type | First order shape of slip profile | Following classifications outlined by Manighetti et al. (2001):
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| Dominant propagation direction | Direction that fault is preferentially propagating in | For unilaterally-propagating faults (tip- or half-restricted) as well as DTR and elliptical-with-taper faults that show a strong sense of preferred propagation | |||||||||
| Clarity rating | How well profile is fit by first-order shape |
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| Segments | Estimated number of segments that fault is formed from | Interpreted from displacement minima and mapping observations. | |||||||||
| Notes | Remaining miscellaneous information about the fault | e.g. channel incision, anomalous topographic features |
Files
EGR_faults.geojson
Files
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Additional details
References
- Manighetti, I., King, G.C.P., Gaudemer, Y., Scholz, C.H. and Doubre, C., 2001. Slip accumulation and lateral propagation of active normal faults in Afar. Journal of Geophysical Research: Solid Earth, 106(B7), pp.13667-13696.
- Williams, J.N., Wedmore, L.N., Scholz, C.A., Kolawole, F., Wright, L.J., Shillington, D.J., Fagereng, Å., Biggs, J., Mdala, H., Dulanya, Z. and Mphepo, F., 2022. The Malawi Active Fault Database: an onshore‐offshore database for regional assessment of seismic hazard and tectonic evolution. Geochemistry, Geophysics, Geosystems, p.e2022GC010425.
- Styron, R. and Pagani, M., 2020. The GEM global active faults database. Earthquake Spectra, 36(1_suppl), pp.160-180.