Signal Processing
Calculating Background Seismic Noise Levels: A Step-by-Step Guide
Calculating Background Seismic Noise Levels: A Step-by-Step Guide: engineering guidance from QuakeLogic covering vibration monitoring, applications, mea...
READ MORESignal Processing
Engineering notes on PGA, PGV, PGD, response spectra, background seismic noise, and ground-motion data processing.
Seismometer
Linearity, Repeatability and Phase Lag in Digital Sensors
Three performance metrics decide whether a digital sensor's data can be trusted in seismic and structural monitoring. Definitions, test methods and why…
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Signal Processing
How to Compute the PGA, PGV, PGD and Response Spectrum of Ground Motion Using Python
How to Compute the PGA, PGV, PGD and Response Spectrum of Ground Motion Using Python: engineering guidance from QuakeLogic covering earthquake engineeri...
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Signal Processing
The Doppler Effect: A Powerful Tool for Structural Health Monitoring
Radar, laser Doppler vibrometry, ultrasound and wireless Doppler sensors measure structural vibration without contact, giving engineers early warning of damage in bridges…
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Signal Processing
Signal-to-Noise Ratio (SNR) in Seismic and Structural Monitoring
What SNR means, how to read dB ranges from unusable (under 0 dB) to excellent (over 40 dB), seven practical ways to…
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Signal Processing
Handling Non-Uniformly Spaced Data Using NUFFT and Sinc Interpolation
A six-step Python example that handles non-uniformly sampled data with pynufft, regrids it with cubic interpolation and reconstructs it using time-domain sinc…
READ MOREMicroseismic Monitoring
Optimizing STA/LTA Settings for Microseismic Earthquake Detection
Start microseismic detection with a 1 s STA window, 20 s LTA window and 4:1 threshold, then tune using historical data and…
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Signal Processing
Third-Octave Vibration Analysis: VDV, PPV and Dominant Frequency
QuakeLogic explains third-octave vibration analysis for buildings: vibration dose value, peak particle velocity, dominant frequency, and the BS, ISO and DIN standards…
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Seismometer
Instrument Response and Phase Corrections in Seismic Data
Raw seismometer output is distorted by the sensor's own response. This explainer gives the deconvolution and phase-correction formulas and why they matter…
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Seismometer
Understanding Lippmann Correction in Seismometers and Its Importance
What Lippmann correction does inside a seismometer: detecting phase shifts, computing correction factors and realigning recorded waveforms with actual ground motion, automatically.
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Infrasound
How to Process Infrasound Data: Baseline and Bandpass Steps
A practical walkthrough of cleaning raw infrasound records: correct baseline drift, bandpass-filter the sub-20 Hz band of interest, calibrate to Pascals, then…
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Infrasound
Converting Infrasound Sensor Data to Pascal: A Step-by-Step Guide
How to turn raw datalogger counts from an infrasound sensor into pressure: ADC resolution and offset give volts, sensor sensitivity in mV/Pa…
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