Read and plot CISMIP formated v2 OR COSMOS formated V2c seismic ground motion records such as posted on CESMD website (Center of Strong Motion Data https://www.strongmotioncenter.org/). The code can also be used to view free field instrument records on the CESMD site and those also available at the HCAI website (https://hcai.ca.gov/construction-finance/facility-detail/ - navigate to a hospital that has instrumented buildings and look under the Instrumented Buildings Tab). Python code reads a zip file containing .v2 or .V2c files that contains one or three channels (Free-Field instruments have 3 channels)
This is a Streamlit version of the ReadV2 application posted as separate application. Does not have all the functions of the ReadV2 application yet.
3/17/2025 Absolute trigger for autoranging was failing for earthquake records that have very low accelerations - revised for a dyanmic trigger based on 1/10 maximum absolute value.
3/29/2025 Added new file name scheme used by USGS in records from the Burma Earthquake.
3/30/2025 Changed the way v2C files read, added error catching if file names dont match standards.
4/4/2025 Changed ADRS spectra to be a vertical arrangement rather than horizontal to avoid titles overlapping. Also implemented a logspace interval for spectra.
5/26/2025 Added ROTD50 spectra and associated ASI computation (with polar gragh plotted against azimuth angles).
5/30/2025 Added Arais Intensity Computation. Added SI and DSI computation.
6/1/2025 Animation of displacements in 3D added.
6/6/2025 Somewhat optimized Animation - put at the end of application to prevent rerun of animation with other options (still looking for a better option).
6/13/2025 Improved map - included marker for epicenter and location of station. Added sliders for elevation and azimuth angles for animation.
7/1/2025 Revised as v2c files dont seem to have consistent names.
7/9/2025 Improved compatibility with older COSMOS formats - can now read CESMD files from the Northridge and Loma Prieta Earthquakes.
7/13/2025 Removed requirement that the zip archive contain only one free-field record. Can now download multiple records at a time from CESMD website and pick one to display.
7/18/2025 Can now read PEER formated files form https://ngawest2.berkeley.edu/ - had to revise many parts to accomodate this new format.
7/19/2025 Added option to write RotD spectra to a file.
7/30/2025 Added CAV calculations - implemented standard CAV calculations.
8/1/2025 Add options for Spectragrams - available for accelerations, velocity or displacment signals.
8/22/2025 Added code to ask user to help identify components if directions are not clear for PEER records.
10/31/2025 Added functions to calculate D5-75 and D5-95 as function of period for a given damping ratio. Also plotted individual spectra computed at each angle as grey lines to show variation between RotD100 and RotD00 Spectra.
12/29/2025 Precision errors in setting array length corrected.
3/31/2026 Added the maximum resultant in all directions (was present in the stand alone version) to the orbit plots.
4/30/2026 Added code written by CSMIP personnel to allow url parameters (for file input). So to run app with a network link for the input file use "https://appreadv2-8tcju9gckv5rnfcrja59nj.streamlit.app/?cesmd_url=URL for file". Added some error catching for invalid URLs.
Try out at https://appreadv2-8tcju9gckv5rnfcrja59nj.streamlit.app/