Broadband instruments are velocity sensors, which record data over a large range of frequencies (typically tens of Hz to around 0.01 Hz or lower). Early observatories would typically consist of multiple instruments sensitive to various frequency bands to replicate a broadband overall response. Because different Earth processes excite energy at various frequencies, understanding and broadening the response spectrum of instruments allows for observing more phenomena. Topics explored include the follwoing.
- Integration and Differentiation
- Long Period Seismograms
- Anthropogenic noise
- Spectral Analysis
- Plotting expected phase arrivals with TauP Toolkit
- Forward Model with Generalized Ray Theory
This exercise was developed by Rob Porritt at University of Southern California (firstname.lastname@example.org) and used as part of the IRIS Interhsip Oritnation Week.
Students will be able to:
- Manipulate time series data in a processing environment (Matlab)
- Convert data from the raw format in digital counts to true ground motion
- Filter seismograms for analysis within various frequency bands
- Isolate ground motion from teleseismic earthquakes
- Visualize anthropogenic sources of noise on records
- Describe the full spectrum of data returned by broadband instruments