AUTOMATIC Location - Area: Valdarno inferiore , magnitude (ML): 0.4
2025-12-20 17:29:06 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-12-20 17:33:34

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Earthquake info - RsniPicker2 automatic location
Event - ID :251220172841
Magnitude (ML) :0.4 +/- 0.4
Origin Time :2025-12-20 17:29:06.1 (UTC)
Location : Latitude: 43.813 N, Longitude: 10.476 E
Area :Valdarno inferiore
Depth (km) :5.90
Distances (km) : 4.3 --- Lucca (LU)
6.1 --- San Giuliano Terme (PI)
7.9 --- Vecchiano (PI)
8.4 --- Capannori (LU)
10.0 --- Calci (PI)
11.9 --- Porcari (LU)
12.2 --- Pisa (PI)
13.0 --- Buti (PI)
13.1 --- Massarosa (LU)
14.9 --- Vicopisano (PI)
16.1 --- Montecarlo (LU)
16.1 --- Cascina (PI)
16.2 --- Altopascio (LU)
16.2 --- Bientina (PI)
18.0 --- Pescaglia (LU)
18.1 --- Calcinaia (PI)
18.7 --- Villa Basilica (LU)
19.4 --- Borgo a Mozzano (LU)
19.4 --- Viareggio (LU)
19.4 --- Pescia (PT)

Quality location estimate:
Erh: 1 km, Erz: 0.7 km, Nf: 10, Gap: 190°, Rms: 0.11 s
Stazioni validate: 4


RsniPicker2 - Automatic location results
Station Net P arrival times P pick
err		 P pick
weight		 P res Nll
weight		 S arrival time S pick
err		 S pick
weight		 S res Nll
weight		 Dist.
PIIIV2025-12-20 17:29:08.9300.01300.011.912025-12-20 17:29:11.0290.03700.001.8212.3
MAIMGU2025-12-20 17:29:08.9000.01300.011.892025-12-20 17:29:10.9420.0430-0.021.7612.8
CARDGU--:---.-----.---.--2025-12-20 17:29:13.7500.0731-0.660.0624.4
POPMGU2025-12-20 17:29:12.5400.0240-0.041.622025-12-20 17:29:17.5700.11720.150.7034.7
VLCMN--:---.-----.---.--2025-12-20 17:29:17.5700.3472-1.250.0839.6
RUFIIV2025-12-20 17:29:18.9900.0490-2.400.022025-12-20 17:29:31.4300.6283-1.380.1483.1


RsniPicker2 - Automatic magnitude (ML) calculation results
Station Net Stat. Mag. Wood-And.
Ampl.		 Dist. (km) Azimuth Used
PII IV0.107.57e-212.3159SI
MAIM GU0.702.64e-112.86SI
CARD GU0.801.16e-124.41SI
POPM GU0.001.89e-234.741SI


Results of PGA, PGV, IH, spectral amplitudes (SA) values calculation
Station Net Channel PGA
(g)		 PGV
(m/s)		 PGD
(m)		 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 IVHHZ6.5902e-66.9394e-70.0000e+04.1758e-77.2775e-71.0144e-68.9108e-61.4122e-67.8951e-81.3798e-812.3159
PII IVHHN1.2855e-51.5698e-60.0000e+04.1701e-78.1648e-78.1648e-71.1411e-51.3663e-67.9671e-81.7262e-812.3159
PII IVHHE1.8223e-51.9349e-60.0000e+05.4486e-71.1066e-61.6534e-61.6737e-51.2661e-69.8546e-82.2133e-812.3159
MAIM GUHHZ2.0521e-52.9908e-60.0000e+07.4452e-71.5033e-62.2551e-61.4896e-52.3846e-61.8480e-73.9728e-812.86
MAIM GUHHN3.1292e-53.3200e-60.0000e+01.1743e-62.2834e-62.2834e-62.3475e-52.4228e-63.1106e-76.1675e-812.86
MAIM GUHHE4.5179e-56.5782e-60.0000e+01.6859e-63.1619e-64.6069e-64.3772e-53.8184e-63.2446e-77.1088e-812.86
CARD GUHHZ9.4932e-69.3627e-70.0000e+03.6674e-76.8987e-79.9902e-71.1153e-57.6816e-76.2187e-81.6101e-824.41
CARD GUHHN2.7360e-53.2086e-60.0000e+01.1919e-62.2379e-62.2379e-62.6261e-53.6777e-61.9424e-74.7750e-824.41
CARD GUHHE3.6725e-53.2422e-60.0000e+09.5228e-71.8690e-62.7686e-62.8914e-52.0526e-61.8818e-74.4989e-824.41
POPM GUHHZ3.5721e-63.5088e-70.0000e+01.5709e-73.0502e-74.5237e-75.5758e-63.5618e-75.2363e-88.2036e-934.741
POPM GUHHN4.9003e-64.3554e-70.0000e+02.5168e-74.7426e-74.7426e-75.2477e-67.5168e-74.0226e-88.5873e-934.741
POPM GUHHE3.4261e-64.6535e-70.0000e+02.6692e-74.7102e-76.7439e-78.7705e-67.5940e-75.0197e-81.0097e-834.741
VLC MNHHZ1.4050e-61.5007e-70.0000e+08.7431e-81.5762e-72.3052e-72.4844e-63.2038e-74.0120e-87.1172e-939.6-1
VLC MNHHN1.6763e-62.6756e-70.0000e+01.2591e-72.2916e-72.2916e-74.3877e-63.7629e-74.2703e-89.2677e-939.6-1
VLC MNHHE1.9022e-62.1008e-70.0000e+01.3393e-72.3541e-73.3184e-73.4796e-63.1262e-76.5257e-85.4404e-939.6-1
*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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