Earths Gravitational Field Calculator
Calculate earthquake Moment magnitude (M_w), Richter scale seismic wave amplitude, tsunami propagation speed v = √(g × d), and geothermal temperature gradients for earths gravitational field.
Input Geophysical Parameters
Enter ocean depth d, seismic wave amplitude, or depth z.
Calculated Tsunami Wave Speed / Value
Shallow Water Wave Theory
In deep ocean trenches (d ≈ 4,000 m), tsunami waves travel at jet airliner speeds: v = √(g × d) ≈ √(9.81 × 4000) ≈ 198 m/s (~713 km/h or 443 mph).
Calculation Methodology & Details
Formula
Applies elastodynamic seismic body/surface wave propagation, International Gravity Formula 1980 (IGF80), and plate tectonic GPS vector velocities.
Important Disclaimer
Calculations assume isotropic crustal rock density and standard gravitational acceleration g = 9.80665 m/s² unless latitude correction is provided.
How to Calculate Step-by-Step
Follow these steps to complete the calculation:
Step 1
Enter ocean depth d (meters), seismograph Wood-Anderson amplitude (mm), or fault area A (km²).
Step 2
Input crustal shear modulus μ (~30 GPa) or fault slip displacement D (meters).
Step 3
View moment magnitude Mw, total seismic energy released in Joules/TNT equivalent, tsunami phase speed (km/h), or P/S seismic wave velocity (km/s).
Detailed Insights & Expert Guide
ℹ️ About this Calculation
The Earths Gravitational Field Calculator calculates earthquake Moment magnitude (Mw), seismic P and S wave propagation velocities, tsunami wave speed in open oceans, Bouguer gravity anomalies, tectonic plate drift rates, and geothermal temperature increases with depth.
Variable Glossary
Moment Magnitude (M_w)
Logarithmic scale measuring total energy released by an earthquake based on seismic moment M₀ = μ × A × D.
Geothermal Gradient
Rate of increasing temperature with respect to increasing depth in the Earth's interior (typically 25 °C/km in continental crust).