LABORATORY 07 · EARTH & SPACE SCIENCES

Seismological Wadati Diagram: Crustal Vp/Vs Velocity Ratio & Origin Time Determination

Determine the crustal P-to-S wave velocity ratio (Vp/Vs) and earthquake origin time by constructing a multi-station Wadati diagram from arrival time records. Explore interactive geophysical simulation, mineral physics, and astronomical observations.

EARTH & SPACE SCIENCES · GEOLOGY · GEOPHYSICS · PLANETARY SCIENCE · ATMOSPHERIC PHYSICS

Your virtual earth & space sciences laboratory.

S-TO-P DIFFERENTIAL TRAVEL TIME (TS - TP)—

CALIBRATED GEOPHYSICAL TELEMETRY

Ready to sample with P Travel Time = 30.0 s.

P-Wave Travel Time From Origin30.0 sSet P Travel Time (s)

Standardized USGS / IAU Earth & Space testing protocol.

Adjust P Travel Time, then execute physical observation.

Geophysical, geochemical, and astrophysical telemetry are recorded using high-precision digital instrumentation and 64-bit IEEE 754 floating-point logging under temperature-controlled laboratory conditions. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support comprehensive geological, planetary, and atmospheric evaluation.

Earth & space constitutive model and observational boundary limits

All astronomical observations, seismic velocity structures, and atmospheric lapse rates are evaluated under standardized USGS, IAU, and IUGG laboratory protocols. Linear constitutive models reflect small-perturbation elastic limits, hydrostatic balances, and standard calibration curves.

Laboratory apparatus & testing equipment.

Regional Seismic Network Multi-Station Telemetry Logger

Standardized university-grade research instrument providing calibrated, traceable observations for Wadati Vp/Vs Velocity Ratio protocols.

Digital Seismic Array Cross-Correlation Signal Processor

Essential secondary analytical hardware ensuring geometric, photometric, or physical accuracy during Wadati Vp/Vs Velocity Ratio measurements.

Calibrated Crustal Earth Velocity Model (IASP91 / AK135)

Primary sample mount, optical cell, or geophysical sensor platform maintaining structural and environmental equilibrium.

Real-Time Seismological Event Processing Workstation

High-precision digital telemetry logger recording real-time scientific telemetry conforming to international geological and astronomical standards.

GPS Time-Stamped Data Replay Simulator

Certified reference calibration standard or environmental stabilizer eliminating instrumental baseline drift.

Subduction Zone Benioff Array Seismogram Database

Precision measurement tool ensuring sensor alignment, zero-tare accuracy, and elimination of systematic testing bias.

FOLLOW THE METHOD

A reason behind every step.

Determine the crustal P-to-S wave velocity ratio (Vp/Vs) and earthquake origin time by constructing a multi-station Wadati diagram from arrival time records. Standardized parameter settings: 10.0, 20.0, 30.0, 40.0, 50.0, 60.0 s.

Step 1
Instrument Initialization & Environmental Baseline Tare
Power on the analytical instrumentation for Wadati Vp/Vs Velocity Ratio, calibrate baseline telemetry against certified reference standards, and verify optical/mechanical alignment.
Step 2
Specimen Preparation & Geological Conditioning
Prepare, cut, calibrate, or orient the testing specimens under strictly regulated environmental laboratory conditions conforming to USGS and IAU guidelines.
Step 3
Independent Setpoint Parameter Adjustment
Adjust the independent testing parameter (P Travel Time) across the designated analytical range (10.0 to 60.0 s) in uniform calibrated steps.
Step 4
Scientific Telemetry Acquisition & Logging
Execute the experimental run and record steady-state telemetry for S-to-P Differential Travel Time (Ts - Tp) with high-precision digital integration.
Step 5
Replicate Inspection & Environmental Equilibrium Check
Perform duplicate test acquisitions at each testing setpoint to verify signal stability, absence of thermal drift, and sample reproducibility.
Step 6
Regression Calculation & Geophysical Parameter Derivation
Plot P Travel Time (s) against Ts - Tp (s), calculate ordinary least-squares (OLS) linear regression parameters, and derive Wadati Crustal Velocity Ratio Factor (Vp/Vs - 1) (W_ratio) against certified reference benchmarks.

YOUR NOTEBOOK · 0 OBSERVATIONS

Turn measurements into planetary insight.

See a complete example report ↗

Points are your recorded observations. The solid regression line validates Wadati Vp/Vs Velocity Ratio mathematical scaling.

LINEAR REGRESSION FIT · y = mx + b

Ts - Tp (s) = 1.7320 · Tp (s) + 0.0500

#	P-Wave Travel Time From Origin (s)	S-to-P Differential Travel Time (Ts - Tp) (s)	P Travel Time (s)	Ts - Tp (s)

No readings yet. Execute a physical observation and record it.

CHECK YOUR UNDERSTANDING

Explain what the geophysical metrics mean.

Question 1: The primary scientific principle investigated in Wadati Vp/Vs Velocity Ratio is:

Question 2: In the evaluation of Wadati Vp/Vs Velocity Ratio, increasing P Travel Time results in:

Question 3: Which regulatory or scientific organization defines official testing specifications for Wadati Vp/Vs Velocity Ratio?

Question 4: Ordinary least-squares (OLS) regression in Wadati Vp/Vs Velocity Ratio is utilized to:

THEORY AND PLANETARY CONTEXT

Earth & Space Sciences background & physical principles.

Determine the crustal P-to-S wave velocity ratio (Vp/Vs) and earthquake origin time by constructing a multi-station Wadati diagram from arrival time records.