MANUAL Location - Area: Francia , magnitude (ML): 0.5
2025-07-31 03:20:46 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-07-31 07:58:17

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Earthquake info - Manual location
Event - ID :250731032007
Magnitude (ML) :0.5 +/- 0.2
Origin Time :2025-07-31 03:20:46.595 (UTC)
Location : Latitude: 44.239 N, Longitude: 6.678 E
Area :Francia
Depth (km) :10.95
Distances (km) : 27.1 --- Argentera
30.6 --- Pietraporzio
33.5 --- Sambuco
36.2 --- Acceglio
40.2 --- Vinadio
40.3 --- Canosio
40.5 --- Prazzo
41.2 --- Marmora
43.9 --- Aisone
46.5 --- Stroppo
46.5 --- Castelmagno
46.7 --- Bellino
46.9 --- Elva
48.2 --- Celle di Macra
49.3 --- Macra
50.0 --- Demonte
50.0 --- Casteldelfino
51.0 --- Pontechianale
51.9 --- Pradleves
53.7 --- San Damiano Macra

Quality location estimate: Erh: 1.3 km, Erz: 1.1 km, Nf: 30, Gap: 113 °, Rms: 0.21


Manual location results
Station Net P arrival time P pick
err
P pick
weight
P res Nll
weight
S arrival time S pick
err
S pick
weight
S res Nll
weight
Dist.
SURFFR2025-07-31 03:20:52.7500.0130-0.031.602025-07-31 03:20:57.3000.04000.091.4231.0
ISOFR2025-07-31 03:20:53.1400.0140-0.011.632025-07-31 03:20:57.0300.0772-0.650.4832.5
OGDIFR2025-07-31 03:20:53.8850.0200-0.600.502025-07-31 03:21:01.4830.04001.090.0040.4
VINDIV2025-07-31 03:20:54.7670.0200-0.061.432025-07-31 03:20:59.7110.0400-0.660.4741.8
PZZGU2025-07-31 03:20:55.7700.02110.011.582025-07-31 03:21:01.3600.1183-0.870.2747.5
STVGU2025-07-31 03:20:56.4500.02410.171.142025-07-31 03:21:02.0800.1384-0.660.4452.9
MVIFFR2025-07-31 03:20:57.1190.02000.081.462025-07-31 03:21:04.2740.1615-0.330.7254.8
ENRGU2025-07-31 03:20:57.7300.02810.121.322025-07-31 03:21:05.1150.10020.081.1460.2
OGAGFR2025-07-31 03:20:58.3280.02000.031.482025-07-31 03:21:06.1760.0400-0.230.8363.2
TURFFR2025-07-31 03:20:58.6600.0200-0.081.262025-07-31 03:21:07.0700.2126-0.290.7965.0
ESCAFR2025-07-31 03:21:00.1470.02000.171.122025-07-31 03:21:08.6290.0400-0.660.4372.6
SAOFFR2025-07-31 03:21:00.8260.0200-0.011.372025-07-31 03:21:10.1500.0400-0.540.5276.2
RRLGU2025-07-31 03:21:00.8630.02000.031.392025-07-31 03:21:10.5660.0400-0.150.9777.5
BHBGU2025-07-31 03:21:01.3900.03910.161.122025-07-31 03:21:11.4360.04000.140.9781.7
GBOSGU2025-07-31 03:21:03.0740.04420.091.252025-07-31 03:21:14.2490.10020.130.9093.2


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
ISO FRHH0.071.25e-232.5101
PZZ GUHH0.543.00e-247.549
STV GUHH0.651.23e-252.989
ENR GUHH0.913.49e-260.291
OGAG FRHH0.457.86e-363.2350
TURF FRHH0.355.86e-365.0117
ESCA FRHH0.681.00e-272.6129
SAOF FRHH0.283.58e-376.2111
RRL GUHH0.614.98e-377.57
BHB GUHH0.707.37e-381.735


Results of PGA, PGV, IH, spectral amplitudes (SA) values calculation
Station Net Channel PGA
(g)
PGV
(m/s)
IH 0*
(m)
IH 1*
(m)
IH 2*
(m)
Sa(T=0.10)
(g)
Sa(T=0.30)
(g)
Sa(T=1.00)
(g)
Sa(T=3.00)
(g)
Dist.
(km)
Azim.
(°)
ISO FRHHZ1.6625e-62.0052e-71.1402e-73.9824e-81.9139e-82.7746e-64.6845e-73.0461e-84.8910e-932.5101
ISO FRHHN2.0657e-62.9775e-71.0636e-73.4322e-81.6493e-84.7061e-63.3149e-73.1323e-86.1779e-932.5101
ISO FRHHE2.1079e-62.2487e-79.6645e-83.3301e-81.5432e-82.7334e-65.2828e-72.6063e-84.8293e-932.5101
PZZ GUHHZ2.2227e-64.5689e-72.6058e-76.3444e-83.9644e-87.9891e-69.6159e-76.9152e-81.0460e-847.549
PZZ GUHHN2.4751e-64.1639e-72.8825e-79.1395e-84.6146e-88.9972e-61.1721e-66.9596e-89.2644e-947.549
PZZ GUHHE3.2396e-65.9641e-73.0152e-71.1258e-75.3994e-81.1139e-51.1898e-68.3335e-81.1840e-847.549
STV GUHHZ1.4398e-61.8470e-71.1124e-73.4825e-81.6586e-82.5551e-66.3597e-72.2063e-84.0211e-952.989
STV GUHHN1.9013e-61.6897e-71.2544e-74.3585e-82.1490e-83.0847e-67.1372e-73.0130e-83.8352e-952.989
STV GUHHE1.2358e-61.5708e-71.1262e-73.6523e-81.4395e-83.9340e-66.0523e-72.2022e-84.0602e-952.989
ENR GUHHZ3.3279e-63.7692e-71.7264e-77.6603e-83.0852e-85.8603e-65.9195e-75.0724e-88.8185e-960.291
ENR GUHHN8.2334e-68.1067e-73.0179e-71.1468e-75.8223e-81.0504e-51.6158e-68.8780e-81.5031e-860.291
ENR GUHHE1.2162e-51.1073e-62.4519e-77.7440e-83.5841e-87.8631e-61.1725e-67.1193e-82.0993e-860.291
OGAG FRHHZ3.8535e-79.1283e-85.4831e-82.6837e-81.2657e-89.2584e-73.2451e-71.6071e-81.8574e-963.2350
OGAG FRHHN3.3623e-76.1101e-85.4364e-82.2563e-81.0987e-85.6197e-73.4148e-71.8595e-82.0095e-963.2350
OGAG FRHHE2.5426e-77.2078e-85.6711e-84.1279e-82.2093e-85.5672e-72.4703e-72.9011e-82.3491e-963.2350
TURF FRHHZ4.7340e-78.0295e-86.6489e-82.2825e-81.2826e-81.1705e-62.8744e-72.1274e-82.3508e-965.0117
TURF FRHHN4.5091e-78.5213e-86.2424e-81.9583e-81.0703e-81.2635e-63.1784e-71.6702e-81.8565e-965.0117
TURF FRHHE3.6201e-78.4568e-85.8008e-82.5980e-81.6434e-81.1378e-62.6117e-72.3095e-81.7120e-965.0117
ESCA FRHHZ9.3227e-71.3025e-77.2417e-83.3138e-81.5805e-81.0604e-63.6114e-72.1043e-83.0831e-972.6129
ESCA FRHHN1.0860e-61.4208e-78.9170e-84.6567e-82.9580e-82.6824e-62.8398e-74.5506e-86.4695e-972.6129
ESCA FRHHE8.0928e-71.5949e-79.0043e-82.6680e-81.4741e-81.4680e-63.3415e-72.3399e-83.7961e-972.6129
SAOF FRHHZ1.8963e-74.0269e-83.3206e-81.7192e-88.5481e-94.9998e-72.3270e-71.0328e-81.1669e-976.2111
SAOF FRHHN2.3109e-73.5432e-82.9636e-81.9038e-81.1242e-84.9820e-71.7737e-71.1981e-88.8354e-1076.2111
SAOF FRHHE1.9851e-73.2104e-83.3192e-81.6147e-89.7436e-95.1056e-72.5249e-71.1168e-81.0777e-976.2111
RRL GUHHZ3.0898e-76.1930e-82.9219e-81.5756e-88.4199e-96.5832e-71.4159e-71.1652e-81.3837e-977.57
RRL GUHHN2.9151e-75.6966e-84.5807e-82.0740e-89.4793e-98.9887e-72.3446e-71.1137e-81.4080e-977.57
RRL GUHHE2.1651e-75.1471e-84.0204e-82.1462e-81.0243e-88.7303e-72.0592e-71.4879e-81.4610e-977.57
BHB GUHHZ6.6386e-71.0186e-77.1602e-83.4186e-82.1000e-82.5933e-62.9691e-74.1188e-82.6375e-981.735
BHB GUHHN4.7795e-77.2958e-85.6436e-82.2444e-81.5505e-81.3249e-62.4731e-73.2554e-82.0451e-981.735
BHB GUHHE5.6051e-78.0599e-86.3384e-83.9289e-81.9955e-81.0277e-62.6495e-73.8991e-82.2838e-981.735
GBOS GUHHZ6.7584e-71.4197e-78.7004e-82.9889e-82.2646e-81.8144e-63.9721e-74.0735e-83.7629e-993.289
GBOS GUHHN4.7292e-71.0041e-77.4390e-82.3887e-89.3145e-91.5086e-64.2153e-71.3002e-82.5301e-993.289
GBOS GUHHE9.4570e-71.5509e-79.3570e-83.0654e-81.4141e-82.2867e-63.5478e-71.7797e-83.2912e-993.289
*IH (Housner Intensity) calculated on the velocity spectrum (SV) between 0.1 and 0.5 s (IH0), 0.1 and 1.0 s (IH1), 0.1 and 1.5 s (IH2)

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