Dates across Phases
Kate
Greetings-
I am developing code for a paleoseismic site with
two earthquakes that have complex relationship with three Phases A, B, C. The
first earthquake horizon is somewhat uncertain, but can be confidently bounded
by layers A and C, the second earthquake is between B and C. There is good
stratigraphic evidence to separate the Phases, but no reason (eg change in
sedimentation characteristics) to impose additional boundaries.
EQ2 is easy- use Date command between
Phases B and C. EQ1 is trickier. An iterative approach
would be use KDE Plot for each Phase [KDE Plot ("PhaseA")], then
Combine (A and C), or Span. Does someone
have suggestion of more linear way to code?
Thanks!
Plot()
{
Sequence(“Paleoearthquakes”)
{
Boundary(“Base”);
Phase("A")
{
R_Date("A1",1730,60);
R_Date("A2",1725,40);
};
Phase("B")
{
R_Date("B1",1450,45);
R_Date("B2",1360,30);
};
Date("EQ 2");
Phase("C")
{
R_Date("C1",1190,60);
R_Date("C2",1295,40);
R_Date("C3",1275,45);
R_Date("C4",1270,70);
};
Boundary("top");
};
};
MILLARD, ANDREW R.
Dear Kate,
You need to add some more structure in the middle of the model, to indicate that there are no stratigraphic relationships between EQ1 and phase B plus EQ2, but that EQ1 fits there between A and C. This should do what you describe. You can check in the model view that this represents what you intended.
Plot()
{
Sequence(“Paleoearthquakes”)
{
Boundary(“Base”);
Phase("A")
{
R_Date("A1",1730,60);
R_Date("A2",1725,40);
};
Phase(“Middle parts”){
Date(“EQ 1”);
Sequence(“B & EQ2”){
Phase("B")
{
R_Date("B1",1450,45);
R_Date("B2",1360,30);
};
Date("EQ 2");
};
};
Phase("C")
{
R_Date("C1",1190,60);
R_Date("C2",1295,40);
R_Date("C3",1275,45);
R_Date("C4",1270,70);
};
Boundary("top");
};
};
Best wishes
Andrew
--
Dr. Andrew Millard
Associate Professor of Archaeology,
Durham University, UK
Email: A.R.M...@durham.ac.uk
Personal page: https://www.durham.ac.uk/staff/a-r-millard/
Dunbar 1650 MOOC: https://www.futurelearn.com/courses/battle-of-dunbar-1650
From: ox...@googlegroups.com <ox...@googlegroups.com>
On Behalf Of Kate
Sent: 28 October 2024 18:52
To: OxCal <ox...@googlegroups.com>
Subject: Dates across Phases
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