Cape Modern Geothermal Field Seismic Attenuation and Microseismic Spectra

Featuring a 1D P-wave attenuation profile and derived source parameters from approximately 6,700 microseismic events recorded at the Cape Modern geothermal field. Data were collected during a stimulation period from mid-February to mid-March 2024 and include raw DAS P-wave arrival spectra, noise spectra, and well log measurements. Python scripts are provided for reading, processing, and visualizing the data.

Use Cases

• Estimate frequency-independent Q values for the upper ~2.5 km using along-depth spectral ratios in the 20-200 Hz band.
• Derive microseismic source parameters like moment magnitude and corner frequency using a single-spectral fitting approach based on the Brune model.
• Analyze raw DAS P-wave arrival spectra and associated noise spectra calculated over 0.1 s windows for event characterization.
• Correlate well log measurements, such as density and P-wave velocity, with the derived attenuation profile and microseismic activity.

Strengths

• Includes data from approximately 6,700 microseismic events, providing a substantial event catalog.
• Covers a specific stimulation period from mid-February to mid-March 2024, offering a focused temporal snapshot.
• Provides derived source parameters and a 1D attenuation profile down to ~2.5 km depth with associated well logs.
• Includes Python scripts for data access and visualization, facilitating reproducibility and analysis.

Limitations

• The dataset represents a single location (Cape Modern geothermal field) and a one-month period, limiting generalizability.
• Source parameters are reported as median values across selected channels, which may smooth out event-level variability.
• The attenuation profile is estimated for the upper ~2.5 km only and may not characterize deeper structures.

Provenance

Source

Department of Energy

Collection Method

Data collected via downhole Distributed Acoustic Sensing (DAS) array during a geothermal stimulation; parameters derived using spectral analysis and the Brune model.

Time Range

mid-February to mid-March 2024

Freshness

Data was last updated in March 2026 and covers events from early 2024.

Geography

Cape Modern geothermal field, specifically the Delano 1OB well