MANUAL Location - Area: Alpi Apuane , magnitude (ML): 0.9
2025-04-11 15:20:52 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-04-14 07:44:07

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Earthquake info - Manual location
Event - ID :250411151929
Magnitude (ML) :0.9 +/- 0.2
Origin Time :2025-04-11 15:20:52.906 (UTC)
Location : Latitude: 43.937 N, Longitude: 10.442 E
Area :Alpi Apuane
Depth (km) :2.02
Distances (km) : 4.1 --- Pescaglia
6.9 --- Fabbriche di Vallico
9.6 --- Borgo a Mozzano
10.8 --- Massarosa
11.0 --- Camaiore
11.5 --- Lucca
13.5 --- Stazzema
13.5 --- Vergemoli
13.9 --- Gallicano
14.4 --- Bagni di Lucca
14.8 --- Capannori
15.3 --- Molazzana
15.6 --- Coreglia Antelminelli
15.6 --- Barga
16.3 --- Villa Basilica
16.9 --- Pietrasanta
17.1 --- Viareggio
17.7 --- Vecchiano
17.9 --- Porcari
18.3 --- Seravezza

Quality location estimate: Erh: 0.6 km, Erz: 0.5 km, Nf: 18, Gap: 116 °, 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.
MAIMGU2025-04-11 15:20:54.7600.00400.300.432025-04-11 15:20:55.5900.0210-0.031.415.3
CARDGU2025-04-11 15:20:55.2500.00600.091.322025-04-11 15:20:56.5800.1815-0.240.5310.6
CMEIT2025-04-11 15:20:55.6040.02000.200.892025-04-11 15:20:57.2910.04000.051.4811.7
BDIIV2025-04-11 15:20:56.7600.0090-0.041.382025-04-11 15:20:59.7900.05810.111.3318.8
PIIIV2025-04-11 15:20:58.1700.01300.001.522025-04-11 15:21:01.9400.0772-0.180.5924.9
VLCMN2025-04-11 15:20:57.7900.01300.011.542025-04-11 15:21:01.4500.20160.100.9925.2
SARMGU2025-04-11 15:20:58.1700.0190-0.091.032025-04-11 15:21:01.6000.3728-0.580.2627.8
POPMGU2025-04-11 15:20:58.5000.01400.161.072025-04-11 15:21:02.5410.11630.141.1328.0
EQUIGU2025-04-11 15:20:59.6850.10040.181.072025-04-11 15:21:03.4600.1033-0.850.0434.4


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.		 Dist. (km) Azimuth
MAIM GUHH1.012.51e+05.3124
CARD GUHH1.241.41e+010.618
CME ITHN1.108.81e-111.7280
BDI IVHH0.913.00e-118.842
PII IVHH0.781.06e-124.9164
VLC MNHH0.951.08e-125.2350
SARM GUEH1.212.84e-127.8353
POPM GUHH0.661.31e-128.064
EQUI GUHH0.644.15e-234.4318


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.
(°)
MAIM GUHHZ3.8101e-51.8429e-51.4869e-51.5791e-58.7884e-68.2438e-56.3279e-51.1572e-56.6760e-75.3124
MAIM GUHHN1.0933e-42.7851e-52.3120e-51.2339e-54.3711e-61.7937e-46.9825e-56.7308e-66.7424e-75.3124
MAIM GUHHE8.0096e-52.4479e-52.0546e-51.4697e-58.2519e-61.4061e-41.2499e-41.0774e-57.8103e-75.3124
CARD GUHHZ2.3277e-55.0423e-63.1595e-63.6071e-61.9142e-63.6675e-51.5218e-52.5922e-61.3823e-710.618
CARD GUHHN6.0564e-58.9967e-67.6297e-67.3812e-65.9898e-61.3208e-44.9075e-58.2946e-64.8022e-710.618
CARD GUHHE5.2279e-51.1571e-58.9140e-68.7962e-65.0119e-61.4475e-44.0268e-55.2186e-63.8824e-710.618
CME ITHNZ2.7664e-54.2600e-64.2273e-62.1453e-67.3408e-76.3091e-52.0260e-51.0501e-61.5306e-711.7280
CME ITHNN3.7345e-57.8960e-68.3462e-65.3290e-62.5911e-61.0655e-44.8175e-53.2787e-62.3688e-711.7280
CME ITHNE3.3059e-57.0556e-66.1932e-63.3993e-61.1270e-65.3435e-53.1972e-51.5033e-61.7219e-711.7280
BDI IVHHZ5.4237e-61.2220e-61.1854e-61.1335e-65.6942e-77.9358e-67.1088e-67.2419e-75.4435e-818.842
BDI IVHHN5.6146e-61.6723e-61.6978e-61.7937e-61.5539e-61.8428e-58.9017e-62.7398e-69.6411e-818.842
BDI IVHHE4.9858e-62.0233e-61.9927e-62.1198e-61.1224e-61.5661e-51.5878e-51.1435e-67.8137e-818.842
PII IVHHZ3.3607e-68.3905e-77.7556e-73.9646e-71.5520e-78.8007e-63.9053e-62.0093e-72.4269e-824.9164
PII IVHHN3.6116e-67.5635e-77.2274e-74.5162e-72.2097e-78.2997e-63.3057e-62.4774e-71.9701e-824.9164
PII IVHHE4.3669e-61.1190e-61.0075e-63.5922e-71.4356e-71.1701e-54.7186e-62.1273e-73.2753e-824.9164
VLC MNHHZ4.2938e-68.7773e-74.2386e-77.9223e-79.6004e-75.2115e-62.3517e-61.3868e-66.3774e-825.2350
VLC MNHHN4.7346e-68.6671e-78.4341e-75.6180e-72.6092e-76.3137e-63.7536e-64.0812e-73.0024e-825.2350
VLC MNHHE3.8389e-68.0691e-77.6530e-75.1027e-72.1918e-75.9790e-63.8301e-62.3447e-72.7425e-825.2350
SARM GUEHZ1.7958e-65.9310e-75.4241e-74.9364e-73.5312e-74.0048e-62.3479e-66.0077e-72.2367e-827.8353
SARM GUEHN3.0277e-61.6698e-61.3387e-61.9533e-61.2602e-64.6109e-64.8360e-61.5532e-68.1791e-827.8353
SARM GUEHE2.0459e-67.8228e-76.8192e-76.0706e-72.9528e-73.8805e-64.3821e-62.6347e-72.3003e-827.8353
POPM GUHHZ3.1393e-67.7710e-76.5059e-75.8443e-73.2253e-77.9368e-63.6230e-63.7756e-73.1615e-828.064
POPM GUHHN4.3388e-61.0343e-61.0382e-66.3118e-72.6151e-71.3123e-59.4644e-63.6065e-73.9949e-828.064
POPM GUHHE4.3132e-61.3763e-61.2359e-66.2551e-72.3366e-78.9666e-66.2045e-62.9870e-73.5359e-828.064
EQUI GUHHZ3.0729e-64.9657e-73.6209e-72.0268e-78.7029e-83.8855e-62.1498e-61.0792e-71.5695e-834.4318
EQUI GUHHN2.1889e-64.4256e-73.3185e-72.5235e-79.6072e-86.4430e-61.7648e-61.0835e-71.2542e-834.4318
EQUI GUHHE2.0004e-63.8526e-73.2345e-72.5791e-71.0261e-75.2224e-61.8228e-61.2521e-71.2794e-834.4318
*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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