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Imperial Valley Dark Fiber Project (IVDF): Brawley EQ Cluster Catalog and DAS Event Dataset

Published by Rice University | Department of Energy | Catalog Last Checked: April 13, 2026 at 03:37 AM | Dataset Last Updated: April 12, 2026 at 04:16 PM
The Imperial Valley Dark Fiber (IVDF) project deployed a distributed acoustic sensing (DAS) interrogator on a pre-existing dark fiber cable running ~28 km between Calipatria and Imperial, California, passing through the Brawley Geothermal Field and surrounding Brawley Seismic Zone in Southern California. DAS measurements provided a dense array of ~6,900 virtual sensors along the cable with a mean channel spacing of approximately 4 m (described in Ajo-Franklin et al., 2022, linked below). This dataset contains waveform recordings of 16 local seismic events from a ~3-hour swarm-like sequence that occurred on May 14, 2021, in the Brawley Seismic Zone. Six events were identified in the Southern California Seismic Network (SCSN) catalog; the remaining ten were detected using the DAS array. All 16 events are located on a strike-slip fault (strike ~222 deg., dip ~80deg.) within a compact rupture zone of ~0.5 km diameter at depths of approximately 8.9-9.4 km, with local magnitudes ranging from ML 0.78 to 2.03. Hypocenters were determined on the fault plane by cross-correlation of DAS channel waveforms, referenced to event 14 (ML 1.22). The accompanying README provides general data informaiton, as well as naming and content descriptions of each file. Event origin times, locations, and magnitudes are provided in the accompanying catalog file (catalog_DASreloc_222-80_20210514.csv).

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
                                            [
  "019:20"
]
contactPoint 
                                            {
  "fn": "Jonathan Ajo-Franklin",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:ja62@rice.edu"
}
dataQuality 
                                            true
description The Imperial Valley Dark Fiber (IVDF) project deployed a distributed acoustic sensing (DAS) interrogator on a pre-existing dark fiber cable running ~28 km between Calipatria and Imperial, California, passing through the Brawley Geothermal Field and surrounding Brawley Seismic Zone in Southern California. DAS measurements provided a dense array of ~6,900 virtual sensors along the cable with a mean channel spacing of approximately 4 m (described in Ajo-Franklin et al., 2022, linked below). This dataset contains waveform recordings of 16 local seismic events from a ~3-hour swarm-like sequence that occurred on May 14, 2021, in the Brawley Seismic Zone. Six events were identified in the Southern California Seismic Network (SCSN) catalog; the remaining ten were detected using the DAS array. All 16 events are located on a strike-slip fault (strike ~222 deg., dip ~80deg.) within a compact rupture zone of ~0.5 km diameter at depths of approximately 8.9-9.4 km, with local magnitudes ranging from ML 0.78 to 2.03. Hypocenters were determined on the fault plane by cross-correlation of DAS channel waveforms, referenced to event 14 (ML 1.22). The accompanying README provides general data informaiton, as well as naming and content descriptions of each file. Event origin times, locations, and magnitudes are provided in the accompanying catalog file (catalog_DASreloc_222-80_20210514.csv).
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identifier https://data.openei.org/submissions/8658
issued 2026-04-08T06:00:00Z
keyword 
                                            [
  "Brawley Field",
  "Brawley Seismic Zone",
  "DAS",
  "Distributed Acoustic Sensing",
  "Earthquake",
  "Fiber Optic Sensing",
  "HDF5",
  "Imperial Valley",
  "SCSN",
  "Salton Sea",
  "Seismicity",
  "Southern California Seismic Network",
  "energy",
  "event catalog",
  "geophysics",
  "geothermal",
  "processed data",
  "raw data",
  "swarm",
  "waveform recordings"
]
landingPage https://gdr.openei.org/submissions/1829
license https://creativecommons.org/licenses/by/4.0/
modified 2026-04-12T16:16:08Z
programCode 
                                            [
  "019:006"
]
projectLead Alexandra Prisjatschew
projectNumber EE0035524
projectTitle Using Dark Fiber and Distributed Acoustic Sensing (DAS) to Map and Monitor Geothermal Resources at the Basin Scale
publisher 
                                            {
  "name": "Rice University",
  "@type": "org:Organization"
}
spatial 
                                            "{"type":"Polygon","coordinates":[[[-115.8,33],[-115.4,33],[-115.4,33.4],[-115.8,33.4],[-115.8,33]]]}"
title Imperial Valley Dark Fiber Project (IVDF): Brawley EQ Cluster Catalog and DAS Event Dataset

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