MANUAL Location - Area: Zona Chianti , magnitude (ML): 1.2
2025-09-28 09:30:49 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-09-29 07:04:29

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Earthquake info - Manual location
Event - ID :250928093006
Magnitude (ML) :1.2 +/- 0.2
Origin Time :2025-09-28 09:30:49.348 (UTC)
Location : Latitude: 43.681 N, Longitude: 11.219 E
Area :Zona Chianti
Depth (km) :5.05
Distances (km) : 3.0 --- Impruneta
3.7 --- San Casciano in Val di Pesa
9.3 --- Scandicci
11.1 --- Firenze
11.3 --- Bagno a Ripoli
12.1 --- Montespertoli
13.1 --- Lastra a Signa
13.4 --- Greve in Chianti
13.6 --- Tavarnelle Val di Pesa
14.9 --- Signa
15.3 --- Fiesole
15.7 --- Barberino Val d Elsa
16.8 --- Montelupo Fiorentino
16.9 --- Campi Bisenzio
17.2 --- Sesto Fiorentino
18.7 --- Incisa in Val d Arno
19.3 --- Rignano sull Arno
20.1 --- Poggio a Caiano
20.4 --- Calenzano
20.5 --- Certaldo

Quality location estimate: Erh: 1 km, Erz: 1.1 km, Nf: 22, Gap: 113 °, Rms: 0.31


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.
OSSCIV2025-09-28 09:30:53.4450.02000.022.222025-09-28 09:30:56.3220.0400-0.022.1618.5
CSNTIV2025-09-28 09:30:54.4000.5009-0.410.872025-09-28 09:30:58.0300.0400-0.630.6724.3
RUFIIV2025-09-28 09:30:55.5400.1004-0.011.922025-09-28 09:30:59.5250.0400-0.580.6729.5
POPMGU2025-09-28 09:30:59.6900.0200-0.031.982025-09-28 09:31:06.9810.0400-0.580.6655.1
PIIIV2025-09-28 09:30:59.8850.0200-0.031.982025-09-28 09:31:06.4260.0400-1.230.1756.2
MAIMGU2025-09-28 09:31:01.2840.0200-0.051.862025-09-28 09:31:08.6050.0400-1.610.0764.0
BDIIV2025-09-28 09:31:01.6490.0200-0.061.812025-09-28 09:31:10.2200.0400-0.880.4165.7
CARDGU2025-09-28 09:31:03.9780.02001.610.072025-09-28 09:31:12.5040.04000.370.6070.6
VLCMN2025-09-28 09:31:06.0480.02001.180.302025-09-28 09:31:16.6260.04000.211.0085.5
SARMGU2025-09-28 09:31:06.0600.02000.990.262025-09-28 09:31:16.9330.04000.201.0286.3
EQUIGU2025-09-28 09:31:08.6480.10041.210.312025-09-28 09:31:20.4980.2506-0.291.00101.1


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
OSSC IVHH1.043.36e-118.5173
POPM GUHH1.321.61e-155.1318
PII IVHH1.003.56e-256.2275
MAIM GUHH0.871.81e-264.0294
BDI IVHH1.205.11e-265.7311
CARD GUHH1.375.23e-270.6303
VLC MNHH1.201.61e-285.5309
SARM GUEH1.444.63e-286.3311
EQUI GUHH1.573.66e-2101.1303


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.
(°)
OSSC IVHHZ2.0530e-52.8102e-61.3277e-65.0506e-71.9957e-74.4937e-54.9571e-62.9292e-75.6377e-818.5173
OSSC IVHHN2.5647e-53.5851e-62.2337e-68.5304e-74.4341e-77.5132e-51.0769e-56.2973e-71.0201e-718.5173
OSSC IVHHE6.1179e-57.2990e-62.9427e-69.5301e-75.7451e-71.1295e-41.1178e-58.6152e-71.6603e-718.5173
POPM GUHHZ3.3811e-65.5183e-74.1851e-71.2984e-76.3916e-81.3209e-52.0778e-69.3109e-81.3025e-855.1318
POPM GUHHN8.1989e-62.0158e-61.3819e-63.1899e-71.7827e-73.0817e-55.8063e-62.7729e-75.1981e-855.1318
POPM GUHHE7.6469e-61.6803e-61.2040e-62.6228e-71.5029e-71.5246e-57.2373e-62.4399e-74.4072e-855.1318
PII IVHHZ1.8784e-64.1810e-73.3694e-79.9817e-84.9058e-82.8445e-61.7174e-67.6069e-81.1370e-856.2275
PII IVHHN1.1301e-63.5977e-73.4264e-71.2401e-76.5442e-83.6494e-63.2972e-67.6852e-89.0276e-956.2275
PII IVHHE1.8736e-64.9321e-73.4415e-71.3298e-75.4537e-83.2200e-61.9472e-67.7449e-81.2678e-856.2275
MAIM GUHHZ1.3054e-62.4779e-71.8973e-79.0862e-84.2014e-83.6018e-69.3191e-75.5250e-86.0345e-964.0294
MAIM GUHHN1.2701e-62.2999e-72.0107e-78.0787e-83.8244e-84.5117e-69.6341e-74.7844e-86.0958e-964.0294
MAIM GUHHE1.4080e-62.4396e-71.6894e-78.8644e-84.3193e-85.7586e-69.9332e-75.2562e-86.4824e-964.0294
BDI IVHHZ2.0452e-63.4358e-73.1154e-71.2645e-74.8581e-83.9281e-62.5330e-66.8909e-88.1538e-965.7311
BDI IVHHN2.4813e-64.6376e-73.5573e-71.4250e-75.6085e-87.9370e-62.1595e-67.6834e-81.3971e-865.7311
BDI IVHHE2.3618e-65.5078e-74.8889e-72.2200e-79.5889e-87.8664e-62.9809e-61.2136e-71.4821e-865.7311
CARD GUHHZ1.7808e-62.9008e-72.2035e-71.1894e-75.7624e-84.7438e-61.5854e-67.3450e-89.2578e-970.6303
CARD GUHHN5.0974e-67.9353e-75.2491e-71.7917e-77.4102e-81.2893e-52.5733e-61.0461e-71.6941e-870.6303
CARD GUHHE4.6520e-67.6854e-75.6093e-72.0932e-78.5809e-82.0710e-53.9997e-61.1373e-71.9495e-870.6303
VLC MNHHZ9.2334e-71.4120e-76.5545e-84.1777e-82.5550e-81.5525e-63.8073e-73.3620e-82.3960e-985.5309
VLC MNHHN7.9433e-71.7505e-71.3677e-77.1135e-83.6885e-81.5046e-61.0178e-63.9547e-84.3265e-985.5309
VLC MNHHE1.1143e-61.3759e-71.1103e-76.7114e-82.7177e-81.2274e-65.1965e-73.4252e-83.6807e-985.5309
SARM GUEHZ9.4415e-71.4349e-71.5212e-71.0366e-75.1509e-81.1338e-61.0548e-66.6820e-85.3963e-986.3311
SARM GUEHN3.5268e-64.5862e-72.5511e-73.4863e-71.3551e-72.6789e-68.7473e-71.3241e-71.2222e-886.3311
SARM GUEHE1.5412e-63.0557e-72.3250e-72.5213e-71.0347e-71.4363e-68.8538e-71.1046e-71.2013e-886.3311
EQUI GUHHZ1.3680e-61.3499e-79.4145e-86.4460e-83.4342e-81.0637e-64.6764e-74.8347e-84.4393e-9101.1303
EQUI GUHHN6.3235e-71.8018e-72.0636e-79.9294e-84.5358e-81.8302e-61.5102e-65.8495e-86.4419e-9101.1303
EQUI GUHHE8.8018e-72.2766e-71.8072e-72.2428e-72.1636e-71.9960e-69.8302e-73.2233e-71.7015e-8101.1303
*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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