CISM RSQSim Parameters - Revision history

Jacquig at 22:06, 7 August 2018

2018-08-07T22:06:57Z

Jacquig at 16:41, 22 May 2017

2017-05-22T16:41:14Z

Jacquig at 16:39, 22 May 2017

2017-05-22T16:39:56Z

Jacquig at 17:35, 15 May 2017

2017-05-15T17:35:07Z

Jacquig at 17:50, 9 May 2017

2017-05-09T17:50:41Z

Jacquig at 17:28, 9 May 2017

2017-05-09T17:28:12Z

Jacquig at 00:09, 9 May 2017

2017-05-09T00:09:43Z

Jacquig at 23:59, 8 May 2017

2017-05-08T23:59:43Z

Jacquig at 23:53, 8 May 2017

2017-05-08T23:53:28Z

Jacquig at 19:56, 8 May 2017

2017-05-08T19:56:09Z

@@ Line 5: / Line 5: @@
 Physical Parameters: <br>
 .	Rate constitutive parameter (A_1)<sup>1</sup> <br>
-&nbsp; &nbsp; a.	Range of values is ~0.003 – 0.01 <br>
+&nbsp; &nbsp; a.	Range of values is ~0.001 – 0.01 <br>
 &nbsp; &nbsp; b.	Strong control on aftershock productivity <br>
 .	State constitutive parameter (B_1)<sup>1</sup> <br>
@@ Line 14: / Line 14: @@
 &nbsp; &nbsp; b.	Scales stress drop, which scales the recurrence times of large events <br>
 .	Initial shear stress (tau0_1)<sup>2</sup> <br>
-&nbsp; &nbsp; a.	Range of values is ~60MPa – 120MPa <br>
+&nbsp; &nbsp; a.	Range of values is ~55MPa – 120MPa <br>
 &nbsp; &nbsp; b.	Shear stress evolves quickly during simulations <br>
 .	Coefficient of friction (mu0_1) <br>
@@ Line 40: / Line 40: @@
 Default Parameters: <br>
-•	A_1 = 0.01<br>
+•	A_1 = 0.001<br>
 •	fA = 0.1<br>
-•	B_1 = 0.015<br>
+•	B_1 = 0.008<br>
 •	Dc_1 = 1.0e-05<br>
 •	mu0_1 = 0.6<br>
-•	tau0_1 = 60<br>
+•	tau0_1 = 55<br>
 •	sigma0_1 = 100<br>
 •	ddotEQ_1 = 1<br>
@@ Line 52: / Line 52: @@
 Optional Slip Weakening Parameters*:<br>
 •	muAmp = 0.2<br>
-•	muInvDist = 2.0<br>
+•	muInvDist = 1.0<br>
 •	''cohesion = 6'' <br>
 *When using the additional slip weakening friction (i.e. setting them to nonzero values), smaller values of a and b are preferred (a = 0.003-0.006, b=0.004-0.006); additionally the cohesion parameter is still optional with the additional weakening parameters.<br><br>
 '''Parameter Sweep Plan:'''<br>
-•	Tuned stresses will be input as initial stresses for new parameter sweep models<br>
+•	Tuned stresses can be input as initial stresses for new parameter sweep models<br>
 &nbsp; &nbsp; - Perturb list of parameters <br>
 &nbsp; &nbsp; - Perturb combinations of parameters to keep other values constant (specifically stress drop)<br>
@@ Line 64: / Line 64: @@
-Main Parameters for Sweep: (Each Million-year catalog requires 15k-20k SU’s on Blue Waters)<br>
+Main Parameters for Sweep: (Each Million-year catalog requires ~10k SU’s on Blue Waters)<br>
 .	A_1 (0.003-0.01)<br>
 .	A_1 and B_1 simultaneously (to keep stress drop constant; (b-a)*sigma)<br>

@@ Line 64: / Line 64: @@
-Main Parameter Sweet List: (Each Million-year catalog requires 15k-20k SU’s on Blue Waters)<br>
+Main Parameters for Sweep: (Each Million-year catalog requires 15k-20k SU’s on Blue Waters)<br>
 .	A_1 (0.003-0.01)<br>
 .	A_1 and B_1 simultaneously (to keep stress drop constant; (b-a)*sigma)<br>

@@ Line 1: / Line 1: @@
-'''RSQSim Paramter Sweep Notes'''
+'''RSQSim Parameter Sweep Notes'''
 ➢	List of main RSQSim parameters for use in deciding on the set of simulations for the parameter sweep. Some parameters work independently, but for several it is the combination that controls important aspects of the simulated catalogs. This list of parameters isn’t meant to be a direct list of the parameters to vary, but a list of the main parameters (and the general range of values for RSQSim calculations) and how they affect untuned RSQSim catalogs.
@@ Line 71: / Line 71: @@
 .	ddotEQ_1 (0.5 – 3)<br>
 .	stressOvershootFactor (0.01 – 0.3)<br>
-.	fA (0.001 – 0.3)<br>
+.	fA (0.01 – 0.3)<br>
 Other potential model variables:<br>

@@ Line 25: / Line 25: @@
 Simulation Parameters: <br>
 .	Rupture slip speed (ddotEQ) <br>
-&nbsp; &nbsp; a.	Range of values is ~1 m/s – 2 m/s <br>
+&nbsp; &nbsp; a.	Range of values is ~0.5 m/s – 3 m/s <br>
 &nbsp; &nbsp; b.	Increasing ddotEQ resulted in higher stress drops for single fault simulations <br>
 .	Stress Overshoot Factor  <br>
-&nbsp; &nbsp; a.	Range of values is ~0.1 – 0.3 <br>
+&nbsp; &nbsp; a.	Range of values is ~0.01 – 0.3 <br>
 &nbsp; &nbsp; b.	Small affect on b-value, but increasing it increases the number large events, particularly M6.3-6.5 <br>
 .	A-reduction Factor (fA) <br>
-&nbsp; &nbsp; a.	Range of values is ~0.1 – 0.2 <br>
+&nbsp; &nbsp; a.	Range of values is ~0.001 – 0.3 <br>
 &nbsp; &nbsp; b.	Increasing fA, increases the rate of small events (and thus b-value) <br>
@@ Line 54: / Line 54: @@
 •	muInvDist = 2.0<br>
 •	''cohesion = 6'' <br>
-*When using the additional slip weakening friction (i.e. setting them to nonzero values), smaller values of a and b are preferred (a = 0.003-0.006, b=0.004-0.006); additionally the cohesion parameter is still optional with the additional weakening parameters.
+*When using the additional slip weakening friction (i.e. setting them to nonzero values), smaller values of a and b are preferred (a = 0.003-0.006, b=0.004-0.006); additionally the cohesion parameter is still optional with the additional weakening parameters.<br><br>
 Other potential model variables:<br>

← Older revision		Revision as of 17:50, 9 May 2017
Line 55:		Line 55:
	• ''cohesion = 6'' <br>		• ''cohesion = 6'' <br>
	*When using the additional slip weakening friction (i.e. setting them to nonzero values), smaller values of a and b are preferred (a = 0.003-0.006, b=0.004-0.006); additionally the cohesion parameter is still optional with the additional weakening parameters.		*When using the additional slip weakening friction (i.e. setting them to nonzero values), smaller values of a and b are preferred (a = 0.003-0.006, b=0.004-0.006); additionally the cohesion parameter is still optional with the additional weakening parameters.
		+
		+
		+	Other potential model variables:<br>
		+	• Parameter heterogeneity<br>
		+	- Varying parameters stochastically <br>
		+	- Varying parameters at depth<br>
		+	• Structural heterogeneity<br>
		+	- Rough faults<br>
		+	- Fractally segmented faults<br>
		+	• Different fault models<br>
		+	• Deep creep<br>

@@ Line 18: / Line 18: @@
 .	Coefficient of friction (mu0_1) <br>
 &nbsp; &nbsp; a.	Range of values is ~0.5 – 0.7 <br>
-&nbsp; &nbsp; b.	Simulations are not very sensitive to changes in the coefficient of friction (according to Bruce’s tests, but I have yet to look over what Bruce was comparing to look for changes) <br>
+&nbsp; &nbsp; b.	Simulations are not very sensitive to changes in the coefficient of friction  <br>
 .	Critical slip distance (Dc_1) <br>
 &nbsp; &nbsp; a.	Range of values is ~1e-4 – 1e-5 <br>