MANUAL Location - Area: Alpi Marittime , magnitude (ML): -0.0
2025-07-31 03:17:37 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-07-31 07:56:01

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Earthquake info - Manual location
Event - ID :250731031643
Magnitude (ML) :-0.0 +/- 0.2
Origin Time :2025-07-31 03:17:37.38 (UTC)
Location : Latitude: 44.050 N, Longitude: 7.624 E
Area :Alpi Marittime
Depth (km) :3.36
Distances (km) : 10.7 --- Briga Alta
13.0 --- Triora
13.2 --- Pigna
13.7 --- Molini di Triora
14.0 --- Castel Vittorio
14.7 --- Mendatica
15.5 --- Montegrosso Pian Latte
16.9 --- Cosio di Arroscia
17.3 --- Limone Piemonte
17.6 --- Rocchetta Nervina
17.9 --- Baiardo
18.9 --- Apricale
18.9 --- Isolabona
19.7 --- Pornassio
20.1 --- Rezzo
20.4 --- Perinaldo
20.5 --- Airole
20.7 --- Olivetta San Michele
21.7 --- Carpasio
22.0 --- Dolceacqua

Quality location estimate: Erh: 0.7 km, Erz: 1.1 km, Nf: 26, Gap: 74 °, Rms: 0.22


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.
MLIGIV2025-07-31 03:17:39.8670.02000.011.902025-07-31 03:17:41.0700.0400-0.700.069.0
SAOFFR2025-07-31 03:17:40.6300.00800.970.012025-07-31 03:17:41.9890.04000.580.599.7
MGROGU2025-07-31 03:17:40.9400.0080-0.230.762025-07-31 03:17:42.7590.1002-1.260.0015.6
TURFFR2025-07-31 03:17:42.7000.01300.650.422025-07-31 03:17:45.4820.1484-0.031.4920.6
ENRGU2025-07-31 03:17:43.0800.06530.490.552025-07-31 03:17:46.2310.1615-0.051.4226.2
IMIGU2025-07-31 03:17:42.8930.0200-0.041.842025-07-31 03:17:46.6540.0842-0.460.2226.9
GBOSGU2025-07-31 03:17:43.0700.01500.061.722025-07-31 03:17:46.9110.0400-0.021.7527.7
STVGU2025-07-31 03:17:43.5220.0200-0.161.222025-07-31 03:17:48.0730.1002-0.031.5732.5
ROROGU2025-07-31 03:17:44.7040.02000.170.982025-07-31 03:17:49.6000.0400-0.011.6536.2
MVIFFR2025-07-31 03:17:47.2150.02001.290.002025-07-31 03:17:52.1450.04000.041.5141.5
ISOFR2025-07-31 03:17:46.5330.0200-0.061.722025-07-31 03:17:53.5560.04000.520.5848.3
PZZGU2025-07-31 03:17:50.0020.02000.420.572025-07-31 03:17:58.0670.0400-0.031.3565.1
BHBGU2025-07-31 03:17:53.3460.02000.181.142025-07-31 03:18:04.0300.28670.000.9991.9


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
SAOF FRHH-0.344.39e-29.7219
MGRO GUHH-0.063.63e-215.693
TURF FRHH-0.361.08e-220.6246
ENR GUHH0.082.63e-226.2321
IMI GUHH0.022.18e-226.9126
GBOS GUHH0.211.20e-227.739
STV GUHH0.221.19e-232.5313
RORO GUHH-0.097.01e-336.279
ISO FRHH-0.193.16e-348.3288
PZZ GUHH0.319.22e-365.1322


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.
(°)
SAOF FRHHZ1.4633e-62.8171e-73.1354e-72.3885e-71.1219e-73.2149e-61.7227e-61.1150e-71.0339e-89.7219
SAOF FRHHN1.3701e-64.4091e-73.6548e-72.7198e-71.1801e-73.4790e-62.8104e-61.2252e-71.2737e-89.7219
SAOF FRHHE2.0873e-63.6002e-72.7878e-72.5408e-71.1596e-73.9613e-61.5305e-61.4789e-71.4096e-89.7219
MGRO GUHHZ8.6226e-72.6917e-72.5213e-71.6985e-76.8831e-82.1391e-61.6662e-67.3595e-87.9068e-915.693
MGRO GUHHN1.0545e-62.8281e-72.5842e-71.9392e-71.1003e-72.3148e-61.6436e-61.6422e-71.0589e-815.693
MGRO GUHHE8.5903e-72.7750e-72.4418e-71.4865e-76.4413e-81.7219e-61.3476e-68.2891e-89.5735e-915.693
TURF FRHHZ5.4958e-77.7694e-85.9675e-84.5849e-81.5917e-81.1141e-62.9341e-71.8932e-82.9315e-920.6246
TURF FRHHN7.2531e-71.3766e-79.7782e-83.7043e-82.2485e-81.7700e-67.0348e-73.3118e-83.2838e-920.6246
TURF FRHHE6.8275e-71.1035e-77.1647e-83.0940e-82.1918e-81.3215e-64.9954e-73.5705e-83.1007e-920.6246
ENR GUHHZ4.0444e-63.4424e-71.9329e-76.0264e-83.2450e-84.0009e-61.0153e-65.2418e-86.7011e-926.2321
ENR GUHHN2.0260e-51.3752e-62.4675e-78.8359e-84.1525e-85.6171e-68.7098e-76.1155e-81.1769e-826.2321
ENR GUHHE2.5402e-52.0005e-61.8983e-79.2695e-84.2011e-85.3087e-66.9486e-76.4463e-81.8401e-826.2321
IMI GUHHZ7.0500e-71.2984e-79.8268e-86.7074e-82.6215e-82.9136e-64.9017e-73.3690e-83.4757e-926.9126
IMI GUHHN1.6645e-62.6526e-72.0451e-71.2151e-76.5783e-83.0529e-67.7772e-77.3790e-87.3160e-926.9126
IMI GUHHE9.0077e-71.2875e-71.0792e-75.6082e-82.3945e-82.0681e-65.4916e-73.6351e-83.6454e-926.9126
GBOS GUHHZ5.5567e-71.1085e-78.5030e-86.6490e-82.4103e-81.4294e-63.6511e-72.9263e-82.8998e-927.739
GBOS GUHHN5.1221e-71.0799e-78.4057e-87.1663e-82.4125e-81.0741e-63.0949e-72.8670e-83.3992e-927.739
GBOS GUHHE5.0076e-78.0493e-87.5036e-86.2379e-82.5191e-81.3389e-63.5790e-72.9530e-83.2521e-927.739
STV GUHHZ1.1288e-61.8591e-71.5152e-74.3309e-82.2622e-82.8037e-69.4139e-73.7388e-86.0689e-932.5313
STV GUHHN7.6667e-71.2702e-78.4761e-82.3944e-81.3470e-81.6884e-64.5842e-71.8674e-82.9814e-932.5313
STV GUHHE1.4588e-62.1652e-71.1796e-73.8835e-81.8461e-82.2309e-65.9192e-72.8083e-84.2871e-932.5313
RORO GUHHZ3.5529e-77.6959e-84.5470e-82.9393e-81.5073e-87.9385e-72.3157e-71.3909e-81.9351e-936.279
RORO GUHHN4.1890e-77.9251e-85.9165e-83.1001e-81.3264e-81.2543e-63.0207e-71.4422e-82.0548e-936.279
RORO GUHHE3.5136e-76.1727e-85.8361e-83.2104e-81.4734e-81.1931e-63.2325e-71.8910e-81.9053e-936.279
ISO FRHHZ1.7177e-72.9166e-81.9170e-89.7159e-95.6530e-94.5866e-78.4361e-88.1748e-98.1249e-1048.3288
ISO FRHHN2.0975e-73.6912e-82.0382e-81.5857e-81.8874e-85.8855e-78.8829e-83.5308e-82.4164e-948.3288
ISO FRHHE1.5884e-72.3856e-81.4679e-87.4877e-95.4520e-94.4537e-76.5929e-88.4125e-96.8725e-1048.3288
PZZ GUHHZ3.6155e-78.1676e-87.1700e-82.6706e-81.5514e-88.2643e-73.4935e-72.2096e-82.3914e-965.1322
PZZ GUHHN4.5907e-78.7736e-88.2293e-83.9207e-81.9643e-81.2607e-63.5717e-72.9959e-82.7402e-965.1322
PZZ GUHHE4.2987e-78.8453e-86.8029e-82.4933e-81.4488e-81.2329e-63.5357e-72.3829e-82.0646e-965.1322
BHB GUHHZ2.9342e-76.5657e-84.8451e-83.4355e-82.1157e-81.0486e-61.7036e-74.1644e-82.1844e-991.9342
BHB GUHHN2.1496e-74.6054e-83.0962e-81.5364e-81.2773e-86.4831e-71.7333e-72.2603e-81.2213e-991.9342
BHB GUHHE2.3388e-75.1490e-85.5405e-83.5310e-81.7196e-86.5514e-71.5259e-73.5738e-81.7752e-991.9342
*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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