MANUAL Location - Area: Valdarno inferiore , magnitude (ML): 1.5
2025-10-23 16:33:11 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-10-24 06:35:35

RSNI Logo


Earthquake info - Manual location
Event - ID :251023163138
Magnitude (ML) :1.5 +/- 0.1
Origin Time :2025-10-23 16:33:11.781 (UTC)
Location : Latitude: 43.661 N, Longitude: 11.086 E
Area :Valdarno inferiore
Depth (km) :17.02
Distances (km) : 1.9 --- Montespertoli
8.0 --- San Casciano in Val di Pesa
9.6 --- Montelupo Fiorentino
11.1 --- Castelfiorentino
12.3 --- Lastra a Signa
12.7 --- Capraia e Limite
13.0 --- Certaldo
13.0 --- Empoli
13.0 --- Tavarnelle Val di Pesa
13.4 --- Scandicci
13.6 --- Signa
13.9 --- Impruneta
14.8 --- Barberino Val d Elsa
17.0 --- Gambassi Terme
17.6 --- Poggio a Caiano
17.9 --- Carmignano
18.2 --- Montaione
18.4 --- Campi Bisenzio
18.6 --- Firenze
18.9 --- Vinci

Quality location estimate: Erh: 0.8 km, Erz: 0.6 km, Nf: 16, Gap: 137 °, Rms: 0.15


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.
OSSCIV2025-10-23 16:33:16.9340.02000.021.672025-10-23 16:33:20.5620.04000.011.5826.5
CSNTIV2025-10-23 16:33:18.0000.0140-0.121.402025-10-23 16:33:22.3900.0982-0.191.1731.5
RUFIIV2025-10-23 16:33:19.8330.02000.011.632025-10-23 16:33:25.6900.1314-0.161.1842.8
PIIIV2025-10-23 16:33:20.7800.0281-0.011.632025-10-23 16:33:26.3200.1514-0.990.1248.7
POPMGU2025-10-23 16:33:21.0830.0200-0.360.522025-10-23 16:33:28.2710.1635-0.300.8753.2
MAIMGU2025-10-23 16:33:22.2500.0472-0.081.542025-10-23 16:33:28.7300.1785-1.250.0957.9
LMDIV2025-10-23 16:33:24.9400.03410.051.312025-10-23 16:33:34.0400.2126-0.550.4970.1
EQUIGU2025-10-23 16:33:29.5820.02001.530.002025-10-23 16:33:40.0610.04000.140.8195.0


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
OSSC IVHH1.393.88e-126.5140
PII IVHH1.682.31e-148.7279
POPM GUHH1.452.34e-153.2328
MAIM GUHH1.499.35e-257.9301
EQUI GUHH1.433.04e-295.0307


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 IVHHZ3.1351e-54.0424e-62.2520e-61.0283e-64.5791e-76.9373e-58.7674e-65.9747e-79.0582e-826.5140
OSSC IVHHN2.4521e-54.5743e-63.3871e-61.3168e-66.2104e-78.0685e-51.5243e-58.1932e-71.2360e-726.5140
OSSC IVHHE5.1672e-58.3749e-64.0597e-61.4433e-68.7079e-71.1949e-41.3053e-51.1828e-61.7411e-726.5140
PII IVHHZ6.9307e-61.8073e-61.2962e-62.8959e-71.4690e-71.6381e-56.9407e-62.2908e-74.1821e-848.7279
PII IVHHN7.1735e-61.9662e-61.9997e-65.7658e-72.9998e-72.5042e-51.8802e-54.3006e-76.3904e-848.7279
PII IVHHE6.6252e-61.7631e-61.6372e-64.7166e-72.2089e-72.3685e-51.4692e-53.4893e-75.5126e-848.7279
POPM GUHHZ6.9974e-61.4661e-68.8753e-72.1273e-71.1438e-72.5331e-54.0753e-61.8699e-73.0041e-853.2328
POPM GUHHN1.9234e-53.4850e-62.1117e-64.7635e-73.0161e-76.1139e-57.4129e-64.7298e-77.7194e-853.2328
POPM GUHHE1.2477e-52.0075e-61.2375e-62.5379e-71.5008e-73.5747e-54.8423e-62.7405e-74.9290e-853.2328
MAIM GUHHZ4.2722e-66.9100e-74.7199e-71.5922e-76.6229e-81.6409e-51.8029e-61.0204e-71.9967e-857.9301
MAIM GUHHN8.8247e-61.6060e-68.0448e-72.7805e-71.0459e-73.3900e-53.4342e-61.7820e-73.4645e-857.9301
MAIM GUHHE6.0612e-61.0693e-65.2738e-72.0927e-71.9101e-71.7174e-52.3364e-62.4872e-74.8756e-857.9301
EQUI GUHHZ2.2341e-64.4933e-72.8413e-71.4010e-77.1204e-83.9081e-61.6544e-68.1487e-89.1888e-995.0307
EQUI GUHHN2.4014e-64.3209e-73.3706e-71.3115e-79.6468e-89.8037e-62.2106e-61.3204e-71.1782e-895.0307
EQUI GUHHE1.4591e-63.6036e-72.9286e-71.3103e-76.6308e-85.1141e-61.3928e-69.0040e-89.0028e-995.0307
*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