MANUAL Location - Area: Valle del Trebbia , magnitude (ML): 0.9
2026-04-21 18:55:44 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2026-04-22 08:46:21

RSNI Logo

Earthquake info - Manual location
Event - ID :260421185518
Magnitude (ML) :0.9 +/- 0.2
Origin Time :2026-04-21 18:55:44.917 (UTC)
Location : Latitude: 44.685 N, Longitude: 9.261 E
Area :Valle del Trebbia
Depth (km) :5.80
Distances (km) : 2.8 --- Zerba
6.3 --- Brallo di Pregola
7.2 --- Cerignale
8.8 --- Ottone
9.0 --- Gorreto
9.8 --- Carrega Ligure
9.9 --- Santa Margherita di Staffora
10.0 --- Fortunago
10.3 --- Corte Brugnatella
11.5 --- Fabbrica Curone
12.0 --- Rovegno
12.6 --- Menconico
13.1 --- Cabella Ligure
13.3 --- Fascia
13.7 --- Bobbio
13.8 --- Rondanina
13.9 --- Coli
14.4 --- Propata
15.3 --- Montacuto
15.4 --- Albera Ligure

Quality location estimate: Erh: 1 km, Erz: 1.2 km, Nf: 22, Gap: 214 °, Rms: 0.17


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.
GORRGU2026-04-21 18:55:47.4300.00400.011.902026-04-21 18:55:49.5710.17250.190.9511.0
TGLIT2026-04-21 18:55:48.9560.0200-0.101.332026-04-21 18:55:52.2620.04000.021.7619.6
RNSIT2026-04-21 18:55:50.0940.0200-0.380.292026-04-21 18:55:54.7260.0400-0.041.6128.2
RNCAGU2026-04-21 18:55:51.3060.0200-0.081.572026-04-21 18:55:56.3080.04000.071.4934.6
BVTIT2026-04-21 18:55:52.0960.0200-1.040.072026-04-21 18:55:59.0560.0400-0.500.4242.3
VRLIT2026-04-21 18:55:52.8810.0200-0.021.782026-04-21 18:55:59.2180.04000.041.4344.4
MSSAIV2026-04-21 18:55:52.7600.0190-0.550.362026-04-21 18:55:59.2280.0400-0.650.3246.2
PCPGU2026-04-21 18:55:55.3900.02810.011.662026-04-21 18:56:03.3240.04000.210.8759.2
GRAMGU2026-04-21 18:55:57.2150.02000.180.972026-04-21 18:56:06.0800.0400-0.071.1667.5
PLMAIV2026-04-21 18:56:00.6920.15061.030.092026-04-21 18:56:10.1970.0400-0.810.2785.0


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
GORR GUHH1.141.05e+011.0164
TGL ITHN0.892.12e-119.6204
RNS ITHN0.881.07e-128.2249
RNCA GUHH0.866.83e-234.6226
BVT ITHN1.201.01e-142.3114
VRL ITHN1.219.43e-244.4138
MSSA IVHH0.763.11e-246.2153
PCP GUHH0.461.02e-259.2255
PLMA IVHH1.131.95e-285.0146


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.
(°)
GORR GUHHZ4.0734e-57.3676e-64.7986e-62.1846e-69.3568e-79.6258e-53.3927e-51.3152e-61.4138e-711.0164
GORR GUHHN4.4497e-51.4584e-58.6203e-63.0418e-61.3643e-61.4877e-45.8076e-52.1708e-63.8566e-711.0164
GORR GUHHE3.6318e-57.6769e-66.3754e-63.6123e-61.4533e-69.1754e-53.8137e-51.6981e-62.5210e-711.0164
TGL ITHNZ2.9290e-54.1556e-61.2652e-64.0269e-71.5985e-72.3175e-57.8676e-62.1900e-73.9981e-819.6204
TGL ITHNN1.4729e-52.4682e-61.9811e-67.8333e-72.9350e-73.4715e-58.3396e-63.5393e-76.5739e-819.6204
TGL ITHNE1.4263e-52.7055e-61.9843e-67.3842e-73.2199e-74.0295e-51.1184e-54.8693e-76.6185e-819.6204
RNS ITHNZ3.5117e-69.1838e-78.1389e-74.1934e-72.0511e-71.0264e-53.8778e-62.4261e-72.7507e-828.2249
RNS ITHNN6.2519e-61.2991e-61.0232e-64.4834e-71.9680e-71.4130e-54.8112e-62.2457e-73.0124e-828.2249
RNS ITHNE4.8670e-61.2313e-61.0653e-65.1268e-72.5120e-71.4929e-55.4040e-62.9540e-72.8299e-828.2249
RNCA GUHHZ2.6416e-65.0754e-73.9361e-71.5376e-76.6138e-86.5647e-62.1967e-68.1462e-81.1578e-834.6226
RNCA GUHHN2.7228e-65.4945e-75.1303e-71.9039e-77.1772e-87.6674e-62.5152e-61.0129e-71.5520e-834.6226
RNCA GUHHE4.7368e-61.0343e-67.3045e-72.1087e-79.4198e-81.3127e-53.0776e-61.4478e-72.4783e-834.6226
BVT ITHNZ2.3368e-64.5855e-74.5617e-73.1886e-71.5007e-74.7767e-62.3304e-61.7210e-71.2551e-842.3114
BVT ITHNN4.6378e-61.0919e-61.0307e-65.9316e-75.9824e-71.1521e-56.6103e-68.7772e-74.1664e-842.3114
BVT ITHNE3.6943e-68.9751e-78.3803e-73.9185e-72.1461e-71.0190e-54.5568e-63.5488e-73.0302e-842.3114
VRL ITHNZ4.2266e-69.3608e-76.0633e-73.4816e-71.9389e-71.1016e-52.4759e-62.3192e-72.1026e-844.4138
VRL ITHNN5.8479e-61.0177e-68.1483e-73.5511e-72.0298e-71.4907e-52.6488e-63.1523e-72.9820e-844.4138
VRL ITHNE4.8279e-69.7009e-78.7329e-73.8746e-71.8251e-72.0462e-54.1766e-62.3473e-72.5079e-844.4138
MSSA IVHHZ1.1376e-62.3946e-71.9881e-71.1285e-74.0789e-84.2497e-61.2329e-65.0038e-86.0339e-946.2153
MSSA IVHHN1.4242e-63.8207e-72.7073e-79.6132e-85.0961e-84.3595e-61.0905e-67.5372e-89.9513e-946.2153
MSSA IVHHE1.2291e-63.0569e-72.1467e-71.3674e-76.2005e-83.9303e-68.5031e-76.9457e-86.9565e-946.2153
PCP GUHHZ4.3019e-71.0271e-79.0295e-85.5279e-82.0693e-81.1284e-65.6444e-72.5799e-82.8887e-959.2255
PCP GUHHN5.0195e-71.0316e-78.1929e-84.7335e-81.5703e-81.4769e-63.3820e-72.0830e-82.6361e-959.2255
PCP GUHHE5.4436e-71.2035e-79.4962e-83.6319e-81.4832e-81.5196e-65.2741e-71.9786e-83.3550e-959.2255
PLMA IVHHZ6.7439e-71.5291e-71.2866e-78.7150e-85.1704e-81.8303e-64.5519e-75.6450e-84.5314e-985.0146
PLMA IVHHN1.3385e-62.5328e-71.8719e-78.6014e-83.8431e-83.6513e-67.3085e-75.1057e-86.7930e-985.0146
PLMA IVHHE1.0201e-62.2044e-71.8136e-76.7975e-85.7016e-82.7297e-61.2371e-68.0664e-86.1552e-985.0146
*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)

rsni