# All Geophysics Formulas List

## Wenner Spacing Soil Resistivity

#### Wenner Spacing - Soil Resistivity:

Soil Resistivity: Electrode Spacing: Voltage at Inner Electrodes: Current at Outer Electrodes: where,
R = Soil Resistivity
S =Electrode Spacing
V =Voltage at Inner Electrodes
I =Current at Outer Electrodes

## Seismic Geophone

#### Seismic Geophone - Overburden or Upper Layer Depth:

Overburden or Upper Layer Depth: Intersection Point Distance: Overburden or Upper Layer Seismic Velocity: Bedrock or Lower Layer Seismic Velocity: Where,

t = Overburden or Upper Layer Depth,
d = Intersection Point Distance,
v1 =Overburden or Upper Layer Seismic Velocity,
v2 =Bedrock or Lower Layer Seismic Velocity.

## Luminosity of Stars

#### Formula Used to calculate luminosity of stars:

L=4*Pi*d2*b

Where

L = Luminosity of the star
d = Distance in meters
b = Brightness in W/m2

## Orbital Speed

#### Formula :

Orbital speed =2 x ∏ x a / T

Where,

a = semimajor axis length
T = Orbital period

## Satellite Orbit Data

#### Formula:

Antenna Azimuth and Elevation Where,

long sat = Satellite Longitude
h = 35,800 km
Ro = 6,370 km

## Topsoil Bulk Density

#### Formula:

Bulk Density of Topsoil (g/cm3) = Dry Soil Weight (g) / Soil Volume (cm3)

## Orbit

#### Formula:

R = 6378.14 + h
V = √( 398600.5 / R)
P = 2π * (R / V) Where,

h = Orbital Altitude
V = Flight Velocity
P = Orbital Period

## Drip

#### Formula:

Dripsday = 1440 * a * b * c
Litersday = Dripsday / 4000
Gallonsday = Dripsday / 3.785
Gallonsyear = Gallonsday * 365

Where,

a = Number of drips per minute
b = Number of faucets in each home
c = Number of homes