Bug #799

psmeca -Sa option: rake angles over 180 not displayed correctly

Added by Frederik almost 6 years ago. Updated almost 6 years ago.

Status:ClosedStart date:2015-10-29
Priority:NormalDue date:
Assignee:Paul% Done:


Target version:Candidate for next bugfix release
Affected version:other Platform:


For rake angles of 181-360, the displayed focal mechanism is incorrect (fortunately obviously so), whereas for the mathematically equivalent rake angle range of -180 to 0 the mechanism is displayed correctly. The following demonstrates this. Both mechanisms represent the identical normal faulting earthquake, but only the one to the left is displayed correctly

psmeca -R-53.5/-50.5/-33.25/-28.75 -JM13 -Sa0.4 <<EOF
-51.686 -31.002 24.5 40 62 -103 5.0 0 0
-51.186 -31.002 24.5 40 62 257 5.0 0 0

Expected behaviour:
1. Treat rake angles 180-360 as equivalent to rake angles -180 to 0 degrees
2. If values for angles are outside expected range, issue warning message

GMT Version 4.5.13 (installed from GMT site, not from the repository)

Result of uname -a:
Linux sec24c43 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
(really Linux Mint 17.2)


#1 Updated by Paul almost 6 years ago

  • Status changed from New to Resolved
  • Assignee set to Paul
  • Target version set to Candidate for next bugfix release
  • % Done changed from 0 to 100

This was fixed a long time ago in GMT 5 but probably ignored in GMT 4. I just added the same fix there as well. I recommend you move to GMT 5.

#2 Updated by Joaquim almost 6 years ago

  • Status changed from Resolved to Closed

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