Changes between Version 4 and Version 5 of UCERF3 ERFs

Timestamp:

Apr 22, 2014, 4:31:57 PM (10 years ago)

Author:

Kevin Milner

Comment:

--

UCERF3 ERFs

@@ -32 +32 @@
 This is a full "true mean" fault system solution. It is similar to the branch averaged fault system solution described above, but instead uses duplicate versions of each rupture whenever a key property (rake, magnitude, area) changes. This retains all variability allowing for quick reproduction of mean UCERF3 results with a minimum set of ruptures. It also allows for the user to, optionally, apply certain approximations to reduce the rupture count (and thus hazard curve compute time) at the expense of accuracy. These approximations are described below. Like the UCERF3 Single Branch ERF, it downloads and caches files in "~/.opensha/ucerf3_erf".
 
+Tests with various settings of the below parameters can be found [http://opensha.usc.edu/ftp/ucerf3_erf/averaging_diffs.xls here]. This shows the min/max/mean variation from true mean hazard curves across all NEHRP sites in California.
+
 === Upper Depth Tolerance ===
 
 Some sections have varying upper depths on different branches due to variable aseismicity values. This parameter combines upper depths within the given tolerance to reduce the subsection (and thus rupture) count. The "Use Mean Upper Depth" parameter allows you to use the average upper depth (default uses the shallower depth).
 
-'''Note with time dependence:''' Time dependent UCERF3 is incompatible certain settings of this parameter. It must be set sufficiently high (e.g. 10 km) in order to prevent multiple instances of a subsection (and thus incorrect recurrence intervals).
+'''Note with time dependence:''' Time dependent UCERF3 is incompatible certain settings of this parameter. It must be set sufficiently high (e.g. 10 km) in order to prevent multiple instances of a subsection (and thus incorrect recurrence intervals). This means that it is impossible to perfectly reproduce mean time dependent UCERF3 results with this ERF, but you can get close.
 
 === Magnitude Tolerance ===