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Station details:
================

Code: TRD
Latitude:   8.50800
Longitude:   76.95850
Elevation:    64.0
Depth: 
Name: Trivandrum
Region: Kerala,India
Status: 

        
Arrival picks statistics
Travel Time Analysis
On the top graph every dot represents the median residual for one month of data. The green line is the overall median; the orange line shows the standard deviation (smad) based on the median absolute deviation (mad), whilst the red line shows twice the standard deviation (2 * smad).
The bottom graph shows the number of residuals for each month. The red columns show the number of residuals whose median (for that month) is outside two standard deviations from the overall median (2 * smad).
Red dots indicate a possible clock error.
Travel time residuals
Amplitude analysis
 On the top graph every dot represents the median value for that month of data.
The green line is the overall median; the orange line shows the standard deviation (smad) based on the median absolute deviation (mad), whilst the red line (if present) shows twice the standard deviation (2 * smad).
The bottom graph shows the number of observations for each month. Any red columns show those observations whose monthly median value is greater than twice the standard deviation (2 * smad) from the overall (running) median (shown in the top graph by red dots).

Red dots indicate a possible calibration error.
 

Station comments:
=================

Checked against station bulletin
Co-ordinates corrected Feb 1998
opened 19660815
BB opened 1998?
Coords corrected >2 km 199905

Data at the ISC for 55 years between 1967 and 2023.

Known station history:
======================

First and Last use refers to the time period in which the coordinates were used by the ISC.

Code   Station name/Region                                           Latitude  Longitude Elevation   Depth  First use   Last use
================================================================================================================================

TRD    Trivandrum                                                     8.50778   76.95830      64.0         25-08-1999 25-08-1999  
       Kerala

TRD    Trivandrum                                                     8.48333   76.95000      64.0         25-08-1999 03-03-2000  
       Kerala

TRD    Trivandrum                                                     8.50800   76.95850      64.0         03-03-2000 03-03-2000  
       Kerala