MANUAL Location - Area: Riviera di ponente , magnitude (ML): 0.6
2025-08-26 16:09:51 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-08-27 08:53:19

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Earthquake info - Manual location
Event - ID :250826160830
Magnitude (ML) :0.6 +/- 0.2
Origin Time :2025-08-26 16:09:51.257 (UTC)
Location : Latitude: 44.165 N, Longitude: 8.277 E
Area :Riviera di ponente
Depth (km) :5.82
Distances (km) : 1.5 --- Tovo San Giacomo
1.6 --- Pietra Ligure
2.1 --- Borgio Verezzi
2.8 --- Giustenice
4.0 --- Magliolo
4.2 --- Loano
4.8 --- Calice Ligure
5.5 --- Boissano
5.5 --- Finale Ligure
6.7 --- Borghetto Santo Spirito
6.8 --- Toirano
7.1 --- Rialto
7.5 --- Orco Feglino
8.7 --- Ceriale
9.3 --- Balestrino
10.1 --- Vezzi Portio
11.7 --- Bardineto
12.0 --- Noli
13.2 --- Spotorno
13.3 --- Bormida

Quality location estimate: Erh: 1 km, Erz: 0.5 km, Nf: 24, Gap: 185 °, Rms: 0.34


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.
ROROGU2025-08-26 16:09:54.9160.0110-0.061.672025-08-26 16:09:57.0560.0400-0.530.9718.8
QLNOIV2025-08-26 16:09:55.1800.0190-0.541.022025-08-26 16:09:57.4630.0400-1.440.2019.6
SVAIT2025-08-26 16:09:55.5730.0200-0.580.952025-08-26 16:09:58.2770.0400-1.400.2122.4
PVTIT2025-08-26 16:09:57.2760.02000.031.672025-08-26 16:10:00.9200.0400-0.740.4232.0
GBOSGU2025-08-26 16:09:57.8100.01500.021.692025-08-26 16:10:02.0390.1023-0.240.9336.5
MGROGU2025-08-26 16:09:58.3600.0301-0.510.932025-08-26 16:10:03.3400.1073-1.110.1440.5
IMIGU2025-08-26 16:09:58.8500.0180-0.011.702025-08-26 16:10:04.0500.1183-0.450.8242.2
PCPGU2025-08-26 16:09:59.7000.03210.021.592025-08-26 16:10:05.4400.0400-0.310.8247.5
MLIGIV2025-08-26 16:10:00.6060.0200-0.180.982025-08-26 16:10:07.0010.0400-0.820.3651.6
SAOFFR2025-08-26 16:10:02.5230.18070.210.692025-08-26 16:10:10.1770.0400-0.131.1561.3
ENRGU2025-08-26 16:10:03.4170.10040.081.132025-08-26 16:10:11.7750.04000.120.9269.1


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
QLNO IVHH0.559.63e-219.617
SVA ITHG0.567.81e-222.443
PVT ITHN0.868.03e-232.0244
GBOS GUHH0.561.59e-236.5284
MGRO GUHH0.441.93e-240.5250
IMI GUHH0.382.08e-242.2227
PCP GUHH0.351.26e-247.527
SAOF FRHH0.305.98e-361.3251
ENR GUHH1.013.26e-269.1276


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.
(°)
RORO GUHHZ4.1722e-54.2035e-69.3070e-72.6952e-71.6601e-77.6843e-53.3514e-63.5522e-79.6521e-818.8251
RORO GUHHN5.6924e-59.4196e-62.6968e-68.1353e-75.2662e-71.4735e-49.1764e-69.3128e-71.8549e-718.8251
RORO GUHHE5.7967e-57.5105e-61.9092e-65.6447e-73.5277e-71.3363e-46.3423e-66.7103e-71.5334e-718.8251
QLNO IVHHZ1.3928e-51.2207e-63.5015e-79.9156e-85.7858e-81.0146e-51.6683e-61.0262e-71.8942e-819.617
QLNO IVHHN1.5431e-51.4165e-64.4944e-71.1079e-75.6491e-81.4558e-51.6991e-61.2114e-72.8374e-819.617
QLNO IVHHE1.8336e-52.3006e-67.1234e-72.5155e-71.3354e-71.7971e-53.2340e-62.1986e-73.8722e-819.617
SVA ITHGZ2.0634e-51.3822e-64.0242e-73.0491e-71.3313e-78.4732e-62.6084e-61.8772e-72.0897e-822.443
SVA ITHGN1.0091e-51.2463e-65.4423e-75.3484e-75.0975e-71.4265e-53.1916e-65.7412e-75.0096e-822.443
SVA ITHGE9.4821e-69.1175e-74.1658e-72.6672e-71.3436e-71.8014e-51.9157e-62.0008e-72.1614e-822.443
PVT ITHNZ1.2859e-51.3230e-64.7440e-73.3208e-71.8143e-71.6648e-52.1275e-61.9096e-72.9634e-832.0244
PVT ITHNN1.5283e-51.7125e-66.1556e-73.3290e-71.8641e-72.7428e-51.9552e-62.0553e-73.9462e-832.0244
PVT ITHNE1.3568e-51.4921e-66.8737e-73.2057e-71.4532e-71.3234e-53.7934e-62.0562e-73.0536e-832.0244
GBOS GUHHZ2.2280e-62.4092e-71.1694e-74.4243e-82.1504e-87.4090e-64.5539e-72.8268e-85.3098e-936.5284
GBOS GUHHN2.0683e-62.6784e-71.2419e-74.3514e-81.9890e-83.6422e-64.7472e-73.0012e-85.3876e-936.5284
GBOS GUHHE2.1513e-62.9994e-71.0990e-74.0507e-81.8271e-84.4629e-65.1416e-72.7291e-85.4862e-936.5284
MGRO GUHHZ1.4785e-61.9340e-71.4028e-76.1687e-82.4125e-82.8913e-66.4784e-73.6178e-85.0015e-940.5250
MGRO GUHHN2.0256e-63.2512e-71.7988e-74.9276e-82.7846e-86.9189e-61.2609e-64.5203e-87.4992e-940.5250
MGRO GUHHE2.2257e-63.5393e-71.8807e-75.8310e-83.1795e-84.7801e-69.1699e-74.3112e-87.7420e-940.5250
IMI GUHHZ1.2704e-61.4127e-79.7408e-84.7419e-81.8737e-82.8430e-66.8213e-72.5167e-83.5425e-942.2227
IMI GUHHN3.2240e-63.8072e-72.1143e-78.4435e-83.4462e-88.0430e-69.3099e-75.4471e-88.6120e-942.2227
IMI GUHHE2.0256e-62.2941e-71.6995e-76.3500e-82.6568e-84.1573e-68.2146e-73.8634e-85.8843e-942.2227
PCP GUHHZ4.7927e-64.1714e-71.1401e-73.7794e-82.0079e-86.6541e-64.5605e-73.5744e-88.2127e-947.527
PCP GUHHN3.1084e-62.9878e-79.3468e-83.1184e-81.7805e-85.2389e-63.8180e-72.4634e-85.3661e-947.527
PCP GUHHE2.9603e-63.2730e-71.1554e-73.4413e-81.7540e-86.0071e-64.2425e-73.0940e-86.7982e-947.527
SAOF FRHHZ2.7733e-74.7444e-84.0349e-81.9327e-81.0656e-86.8329e-72.5539e-71.5717e-81.2091e-961.3251
SAOF FRHHN4.5307e-75.6572e-83.8765e-82.4581e-81.6573e-81.2378e-62.2614e-72.0270e-81.7234e-961.3251
SAOF FRHHE5.1500e-77.2959e-84.2003e-82.2237e-81.2678e-89.2197e-72.3722e-71.6600e-81.6144e-961.3251
ENR GUHHZ2.3331e-63.7110e-71.8318e-74.7956e-82.6433e-85.8594e-67.2139e-74.5068e-88.5348e-969.1276
ENR GUHHN6.8168e-67.1483e-72.3037e-77.2341e-84.1700e-81.0070e-58.8966e-77.6295e-81.5710e-869.1276
ENR GUHHE5.8825e-67.2589e-71.8608e-75.7652e-83.3906e-89.9322e-67.9096e-76.1428e-81.3152e-869.1276
*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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