MANUAL Location - Area: Valdarno inferiore , magnitude (ML): 0.3
2026-08-04 21:00:04 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2026-08-04 21:57:17

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Earthquake info - Manual location
Event - ID :260804205835
Magnitude (ML) :0.3 +/- 0.2
Origin Time :2026-08-04 21:00:04.253 (UTC)
Location : Latitude: 43.708 N, Longitude: 10.385 E
Area :Valdarno inferiore
Depth (km) :8.02
Distances (km) : 1.7 --- Pisa
7.8 --- San Giuliano Terme
8.3 --- Vecchiano
10.8 --- Calci
13.6 --- Cascina
15.1 --- Collesalvetti
15.5 --- Vicopisano
16.5 --- Buti
18.0 --- Lucca
18.1 --- Livorno
18.4 --- Fauglia
18.8 --- Calcinaia
19.0 --- Bientina
19.0 --- Massarosa
20.7 --- Pontedera
20.9 --- Crespina
21.2 --- Viareggio
21.3 --- Capannori
22.2 --- Ponsacco
22.4 --- Lorenzana

Quality location estimate: Erh: 1.3 km, Erz: 1.6 km, Nf: 14, Gap: 258 °, Rms: 0.12


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.
PIIIV2026-08-04 21:00:07.4300.00300.001.862026-08-04 21:00:09.7200.0370-0.061.5413.9
MAIMGU2026-08-04 21:00:09.4600.06230.031.612026-08-04 21:00:13.3800.07320.131.0525.7
CMEIT2026-08-04 21:00:10.0660.02000.021.762026-08-04 21:00:14.2580.0400-0.061.4329.4
CARDGU2026-08-04 21:00:11.9810.02000.760.132026-08-04 21:00:16.3520.0400-0.031.4037.2
BDIIV2026-08-04 21:00:12.5080.0200-0.011.662026-08-04 21:00:18.4600.1675-0.200.8243.8
POPMGU2026-08-04 21:00:13.4200.02000.300.222026-08-04 21:00:20.4000.14440.700.1748.6
EQUIGU2026-08-04 21:00:13.7430.0200-0.310.272026-08-04 21:00:20.2940.3758-0.980.0754.8


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
PII IVHH0.157.11e-213.982
MAIM GUHH0.242.58e-225.721
CME ITHN0.757.26e-229.4346
CARD GUHH0.502.60e-237.212
POPM GUHH0.181.51e-248.638
EQUI GUHH0.216.20e-354.8340


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.
(°)
PII IVHHZ8.0229e-61.1598e-64.0829e-79.9043e-85.8745e-82.3294e-51.7754e-61.0787e-72.5641e-813.982
PII IVHHN1.0518e-51.4971e-65.6804e-71.2804e-78.4208e-82.3156e-53.5076e-61.6039e-73.3610e-813.982
PII IVHHE8.7049e-61.4027e-64.9954e-71.6820e-71.1049e-72.4228e-52.4241e-61.7334e-72.9833e-813.982
MAIM GUHHZ2.8312e-62.9182e-71.2151e-74.0563e-81.6546e-84.0851e-64.5632e-72.7729e-86.5525e-925.721
MAIM GUHHN2.7709e-64.6684e-72.2421e-76.1959e-83.5604e-88.1236e-66.8203e-75.8330e-81.1003e-825.721
MAIM GUHHE2.6481e-63.9734e-71.7967e-76.6672e-83.1649e-85.8214e-65.1419e-74.7860e-87.4869e-925.721
CME ITHNZ2.3196e-63.4864e-73.0994e-72.4194e-71.7350e-75.5085e-61.9641e-62.5294e-71.2773e-829.4346
CME ITHNN3.8094e-65.6828e-74.3877e-74.3362e-74.8985e-76.8689e-62.0831e-68.2584e-73.6091e-829.4346
CME ITHNE4.3100e-65.1563e-73.7830e-72.5647e-71.9449e-76.2082e-61.2788e-61.7503e-71.1947e-829.4346
CARD GUHHZ1.7318e-62.3780e-79.3018e-86.5916e-87.5232e-85.1275e-63.4461e-71.4194e-77.5711e-937.212
CARD GUHHN4.3338e-65.0845e-72.2019e-78.7014e-89.1156e-86.8328e-66.7003e-71.5786e-71.4528e-837.212
CARD GUHHE4.0498e-65.0049e-72.0891e-76.4593e-83.0901e-81.2963e-56.8673e-75.0010e-81.1447e-837.212
BDI IVHHZ6.0212e-77.1864e-83.0337e-88.4832e-94.6633e-96.6999e-71.7194e-77.3549e-91.7846e-943.823
BDI IVHHN4.8175e-78.9368e-86.0134e-81.6607e-89.4318e-91.2931e-63.3794e-71.0679e-82.0077e-943.823
BDI IVHHE4.7087e-77.1266e-84.2349e-81.3470e-87.4392e-91.4153e-62.4696e-79.3467e-91.6938e-943.823
POPM GUHHZ1.5679e-61.6453e-77.3866e-82.6552e-81.6487e-82.5589e-62.6119e-72.7686e-83.9600e-948.638
POPM GUHHN1.3422e-62.3012e-71.5139e-72.9977e-81.6235e-83.4551e-68.4723e-72.8183e-85.4491e-948.638
POPM GUHHE1.3293e-61.7913e-71.2646e-73.6821e-81.8119e-83.4338e-64.7833e-72.6411e-84.2900e-948.638
EQUI GUHHZ3.8032e-77.1711e-84.3335e-82.6004e-81.4459e-88.3642e-72.3238e-71.2293e-82.3266e-954.8340
EQUI GUHHN6.7651e-77.9300e-84.2369e-82.9694e-82.1028e-81.5932e-62.1575e-72.1108e-82.1059e-954.8340
EQUI GUHHE6.1381e-71.0295e-74.0608e-83.2209e-81.9187e-81.3853e-61.7026e-72.1178e-81.8922e-954.8340
*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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