@Override
public Shaking getPSA(
double magnitude,
double sourceLat,
double sourceLon,
double sourceDepthM,
double targetLat,
double targetLon,
double targetElevM,
String amplificationType,
double amplificationProxyValueSI,
double period,
EventParameters eventParameters) {
// Returns median PSA, 16th-percentile PSA, 84th percentile PSA in m/s2 for a given spectral
// period T
// Mag is the magnitude from the EW message
// ampType in Switzerland is deltaI, i.e. intensity increments
// Coefficients are region dependent, i.e. different in the Swiss Alps and in the Swiss Foreland
double rmin = 3; // set cut-off distance
double Mw = magnitude; // reasonable assumption in CH
double[][] cofs = getCofs(sourceLat, sourceLon);
int cnt = 0; // init
double sigma = 0; // init
double amp = 1; // init
// Compute hypocentral distance
double[] pEvent = GeoCalc.Geo2Cart(sourceLat, sourceLon, -sourceDepthM);
double[] pTarget = GeoCalc.Geo2Cart(targetLat, targetLon, targetElevM);
double distance = GeoCalc.Distance3D(pEvent, pTarget);
double Rh = distance / 1000; // in kilometers
// end of hypocentral distance computation
// Assume Rrup ~ Rh
double Rrup = Rh;
// else estimate Rrup based on Cauzzi et al. (2014)
if (Mw >= 5.8) {
Rrup =
Rh
+ 7.5 * Mw
- 38
- 1.38
- 0.014
* exp(
Mw); // 7.5 * Mw + 38 included to avoid negative distances at points with Rh =
// 0 ...
}
// define the distance cut-off
double Ru = max(rmin, Rrup);
// define the distance metric used in the attenuation formulas
double d = log10(Ru);
// pick the right coefficients according to the spectral period
if (period == 0.01) {
cnt = 1;
sigma = 0.3346;
amp = 2.58;
} else if (period == 0.02) {
cnt = 2;
sigma = 0.3346;
amp = 2.57;
} else if (period == 0.03) {
cnt = 3;
sigma = 0.3346;
amp = 2.57;
} else if (period == 0.05) {
cnt = 4;
sigma = 0.3348;
amp = 2.56;
} else if (period == 0.1) {
cnt = 5;
sigma = 0.2953;
amp = 2.55;
} else if (period == 0.2) {
cnt = 6;
sigma = 0.2884;
amp = 2.52;
} else if (period == 0.4) {
cnt = 7;
sigma = 0.2641;
amp = 2.47;
} else if (period == 1) {
cnt = 8;
sigma = 0.2751;
amp = 2.29;
} else if (period == 2) {
cnt = 9;
sigma = 0.2840;
amp = 2.01;
}
double logpsa =
cofs[cnt][0]
+ cofs[cnt][1] * Mw
+ cofs[cnt][2] * pow(Mw, 2)
+ cofs[cnt][3] * pow(Mw, 3)
+ cofs[cnt][4] * pow(Mw, 4)
+ cofs[cnt][5] * pow(Mw, 5)
+ cofs[cnt][6] * pow(Mw, 6)
+ (cofs[cnt][7]
+ cofs[cnt][8] * Mw
+ cofs[cnt][9] * pow(Mw, 2)
+ cofs[cnt][10] * pow(Mw, 3))
* d
+ (cofs[cnt][11]
+ cofs[cnt][12] * Mw
+ cofs[cnt][13] * pow(Mw, 2)
+ cofs[cnt][14] * pow(Mw, 3))
* pow(d, 2)
+ (cofs[cnt][15]
+ cofs[cnt][16] * Mw
+ cofs[cnt][17] * pow(Mw, 2)
+ cofs[cnt][18] * pow(Mw, 3))
* pow(d, 3)
+ (cofs[cnt][19]
+ cofs[cnt][20] * Mw
+ cofs[cnt][21] * pow(Mw, 2)
+ cofs[cnt][22] * pow(Mw, 3))
* pow(d, 4);
// Now add site term
double logpsasite = logpsa + (amplificationProxyValueSI / amp);
// Now compute plus/minus sigma bounds
double logpsasiteplus = logpsasite + sigma;
double logpsasiteminus = logpsasite - sigma;
// Now in m/s2
Shaking PSA = new Shaking();
PSA.expectedSI = pow(10, logpsasite) / 100;
PSA.percentile84 = pow(10, logpsasiteplus) / 100;
PSA.percentile16 = pow(10, logpsasiteminus) / 100;
// Now should return Shaking ...
return PSA;
}
@Override
public Shaking getPGV(
double Mag,
double sourceLat,
double sourceLon,
double sourceDepthM,
double targetLat,
double targetLon,
double targetElevM,
String amplificationType,
double amplificationProxyValueSI,
EventParameters eventParameters) {
// Returns median PGV, 16th-percentile PGV, 84th percentile PGV in m/s
// Mag is the magnitude from the EW message
// ampType in Switzerland is deltaI, i.e. intensity increments
// GMP coefficients are region dependent, i.e. different in the Swiss Alps and in the Swiss
// Foreland
double rmin = 3; // set cut-off distance
double Mw = Mag; // reasonable assumption in CH
double[][] cofs = getCofs(sourceLat, sourceLon);
// Compute hypocentral distance
double[] pEvent = GeoCalc.Geo2Cart(sourceLat, sourceLon, -sourceDepthM);
double[] pTarget = GeoCalc.Geo2Cart(targetLat, targetLon, targetElevM);
double distance = GeoCalc.Distance3D(pEvent, pTarget);
double Rh = distance / 1000; // in kilometers
// end of hypocentral distance computation
// Assume Rrup ~ Rh
double Rrup = Rh;
// else estimate Rrup based on Cauzzi et al. (2014)
if (Mw >= 5.8) {
Rrup =
Rh
+ 7.5 * Mw
- 38
- 1.38
- 0.014
* exp(
Mw); // 7.5 * Mw + 38 included to avoid negative distances at points with Rh =
// 0 ...
}
// define the distance cut-off
double Ru = max(rmin, Rrup);
// define the distance metric used in the attenuation formulas
double d = log10(Ru);
double logpgv =
cofs[10][0]
+ cofs[10][1] * Mw
+ cofs[10][2] * pow(Mw, 2)
+ cofs[10][3] * pow(Mw, 3)
+ cofs[10][4] * pow(Mw, 4)
+ cofs[10][5] * pow(Mw, 5)
+ cofs[10][6] * pow(Mw, 6)
+ (cofs[10][7]
+ cofs[10][8] * Mw
+ cofs[10][9] * pow(Mw, 2)
+ cofs[10][10] * pow(Mw, 3))
* d
+ (cofs[10][11]
+ cofs[10][12] * Mw
+ cofs[10][13] * pow(Mw, 2)
+ cofs[10][14] * pow(Mw, 3))
* pow(d, 2)
+ (cofs[10][15]
+ cofs[10][16] * Mw
+ cofs[10][17] * pow(Mw, 2)
+ cofs[10][18] * pow(Mw, 3))
* pow(d, 3)
+ (cofs[10][19]
+ cofs[10][20] * Mw
+ cofs[10][21] * pow(Mw, 2)
+ cofs[10][22] * pow(Mw, 3))
* pow(d, 4);
// Now add site term
double logpgvsite = logpgv + (amplificationProxyValueSI / 2.35);
// Now compute plus/minus sigma bounds
double sigma = 0.2953;
double logpgvsiteplus = logpgvsite + sigma;
double logpgvsiteminus = logpgvsite - sigma;
// Now in m/s
Shaking PGV = new Shaking();
PGV.expectedSI = pow(10, logpgvsite) / 100;
PGV.percentile84 = pow(10, logpgvsiteplus) / 100;
PGV.percentile16 = pow(10, logpgvsiteminus) / 100;
// Now should return Shaking ...
return PGV;
}
