Changes between Version 3 and Version 4 of UCERF3 ERFs

Timestamp:

Apr 22, 2014, 4:27:36 PM (10 years ago)

Author:

Kevin Milner

Comment:

--

UCERF3 ERFs

@@ -30 +30 @@
 Class name: scratch.UCERF3.erf.mean.MeanUCERF3
 
-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:
+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".
 
 === Upper Depth Tolerance ===
@@ -37 +37 @@
 
 '''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).
+
+=== Magnitude Tolerance ===
+
+Ruptures have varying magnitudes on different branches due to different scaling relationships and even variable aseismicity values. This parameter averages magnitudes within the given tolerance to reduce the ruptures substantially.
+
+'''Note:''' enabling aleatory magnitude variability will first average magnitudes for each rupture!
+
+=== Rake Combining ===
+
+Each Deformation Model supplies its own rakes. You can either use the DM specific rakes for each rupture, or combine otherwise identical ruptures. In this case you can use the weighted averaged rake or the rakes from a specific deformation model.