USGS Energy and Broadband Solution

Sample Energy Solution and Explanation of Parameters

Southern India                    | Geographic region
01/01/26 03:16:41 UTC             | Date and origin time (UTC)
Epicenter: 23.40N 70.32E          | Epicenter:  Latitude and Longitude 
                                  |
Broadband Source Parameters:      |    
ENERGY MAGNITUDE       Me   7.7   | Energy magnitude.
RADIATED ENERGY                   | 
Energy           7.0*10**15 Nm    | Radiated energy in Newton-Meters 
                                  | (equivalent to Joules).
No. of sta: 10  Focal mech.  F    | Number of stations used. 
                                  | Type of focal mechanism used: 
                                  |  F (broadband fault plane solution)  
                                  |  M (Rapid Moment Tensor solution)
				   
BROADBAND DEPTH:        16.0 km   | Broadband depth  from synthetics or 
                                  | differential travel-times of depth 
                                  | phases from broadband displacement
                                  | seismograms.  
BROADBAND FAULT PLANE SOLUTION:   | 
NP1:Strike=300 Dip=45 Slip= 120   | Nodal planes of double-couple focal 
NP2:        81     52        6    | mechanism derived from synthetics 
Principal Axes:                   | of broadband displacement 
T              Plg=69  Azm=289    | waveforms.
P                   4      189    |

COMMENT: Complex earthquake       |
observed on broadband displacement| 
seismograms. A small event is     |
followed by a larger one about 2  |
seconds later. Apparent stress    | Apparent stress  in megapascals.
0.58 Mpa. Differential magnitude  | Differential magnitude  is 
(Mw-Me) -0.05 mu.                 | difference  between energy 
                                  | magnitude and moment magnitude
                                  | in magnitude units.