Skip to content

Fix seis/utilmeca #8821

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
joa-quim merged 4 commits into from
Nov 3, 2025
Merged

Fix seis/utilmeca #8821

Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
f4ebed3
seis/utilmeca: stabilize NP selection near P/T dip tie with epsilon g…
Chuan1937 Oct 31, 2025
b477820
Merge branch 'master' into gmt-meca
Chuan1937 Oct 31, 2025
9f9dea6
Merge branch 'master' into gmt-meca
Chuan1937 Nov 1, 2025
ce3658b
Update src/seis/utilmeca.c
Chuan1937 Nov 3, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 15 additions & 7 deletions src/seis/utilmeca.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -910,13 +910,21 @@ void meca_axe2dc (struct SEIS_AXIS T, struct SEIS_AXIS P, struct SEIS_NODAL_PLAN
}
if (p2 < 0.0) p2 += 360.0;

NP1->dip = d1; NP1->str = p1;
NP2->dip = d2; NP2->str = p2;

im = 1;
if (P.dip > T.dip) im = -1;
NP1->rake = meca_computed_rake2 (NP2->str, NP2->dip, NP1->str, NP1->dip, im);
NP2->rake = meca_computed_rake2 (NP1->str, NP1->dip, NP2->str, NP2->dip, im);
NP1->dip = d1; NP1->str = p1;
NP2->dip = d2; NP2->str = p2;

/* Epsilon-aware tie-break: avoid quadrant swap when P.dip is almost equal T.dip */
if (P.dip > T.dip + SEIS_EPSILON) {
im = -1;
} else if (P.dip < T.dip - SEIS_EPSILON) {
im = 1;
} else {
/* |P.dip - T.dip| <= SEIS_EPSILON: deterministic choice */
im = -1;
}

NP1->rake = meca_computed_rake2 (NP2->str, NP2->dip, NP1->str, NP1->dip, im);
NP2->rake = meca_computed_rake2 (NP1->str, NP1->dip, NP2->str, NP2->dip, im);
}

void meca_dc2axe (st_me meca, struct SEIS_AXIS *T, struct SEIS_AXIS *N, struct SEIS_AXIS *P) {
Expand Down
Loading