RSNI - Manually revised location

MANUAL Location - Area: Frignano , magnitude (M_L): 0.6
2026-04-16 20:50:41 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2026-04-17 07:32:53

Earthquake info - Manual location

Event - ID :	260416204934
Magnitude (M_L) :	0.6 +/- 0.2
Origin Time :	2026-04-16 20:50:41.115 (UTC)
Location :	Latitude: 44.250 N, Longitude: 10.459 E
Area :	Frignano
Depth (km) :	9.57
Distances (km) :	10.5 --- Frassinoro 11.1 --- Villa Collemandina 11.8 --- Castiglione di Garfagnana 11.9 --- Ligonchio 12.5 --- San Romano in Garfagnana 12.7 --- Sillano 12.9 --- Villa Minozzo 13.5 --- Pieve Fosciana 13.6 --- Pievepelago 14.1 --- Camporgiano 14.7 --- Piazza al Serchio 14.8 --- Fosciandora 15.6 --- Riolunato 16.0 --- Castelnuovo di Garfagnana 16.3 --- Toano 16.9 --- Fiumalbo 17.1 --- Busana 17.1 --- Palagano 17.4 --- Giuncugnano 17.6 --- Montefiorino

Quality location estimate: Erh: 1.2 km, Erz: 1.1 km, Nf: 28, Gap: 92 °, Rms: 0.19

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.
SARM	GU	2026-04-16 20:50:43.780	0.012	0	0.05	1.68	2026-04-16 20:50:45.661	0.100	2	-0.03	1.68	13.7
VLC	MN	2026-04-16 20:50:44.330	0.013	0	0.29	1.03	2026-04-16 20:50:45.932	0.040	0	-0.29	0.69	15.4
GSCL	GU	2026-04-16 20:50:43.540	0.009	0	-1.66	0.00	2026-04-16 20:50:45.325	0.040	0	-2.89	0.00	18.3
VGL	IT	2026-04-16 20:50:45.574	0.020	0	0.23	1.22	2026-04-16 20:50:49.200	0.040	0	0.72	0.03	22.9
BDI	IV	2026-04-16 20:50:45.682	0.020	0	-0.32	0.56	2026-04-16 20:50:49.480	0.040	0	-0.14	1.33	25.5
CARD	GU	2026-04-16 20:50:46.170	0.095	4	0.11	1.58	2026-04-16 20:50:50.124	0.087	2	0.40	0.62	26.9
EQUI	GU	2026-04-16 20:50:46.260	0.018	0	-0.02	1.78	2026-04-16 20:50:50.120	0.084	2	0.06	1.65	27.9
FIVI	GU	2026-04-16 20:50:43.889	0.080	3	-2.37	0.03	2026-04-16 20:50:47.885	0.040	0	-2.11	0.03	28.2
POPM	GU	2026-04-16 20:50:47.020	0.020	0	-0.50	0.08	2026-04-16 20:50:52.376	0.255	7	0.08	1.28	34.5
CRR	IT	2026-04-16 20:50:47.344	0.080	3	-0.18	1.19	2026-04-16 20:50:52.515	0.040	0	0.29	1.07	34.8
MAIM	GU	2026-04-16 20:50:48.071	0.020	0	-0.08	1.60	2026-04-16 20:50:53.625	0.100	2	0.23	1.26	38.8
GRAM	GU	2026-04-16 20:50:48.700	0.021	1	-0.10	1.51	2026-04-16 20:50:54.525	0.040	0	0.23	1.27	42.2
ZCCA	IV	2026-04-16 20:50:50.321	0.020	0	0.06	1.69	2026-04-16 20:50:58.363	0.040	0	1.25	0.00	43.9
PLMA	IV	2026-04-16 20:50:50.788	0.100	4	0.03	1.64	2026-04-16 20:50:57.777	0.100	2	-0.01	1.49	54.0

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
GSCL	GU	HH	0.92	2.56e-1	18.3	43
VGL	IT	HG	0.96	1.89e-1	22.9	221
CARD	GU	HH	0.72	8.03e-2	26.9	176
FIVI	GU	HN	0.69	6.88e-2	28.2	267
POPM	GU	HH	0.40	4.95e-2	34.5	134
MAIM	GU	HH	0.37	1.59e-2	38.8	176
ZCCA	IV	HH	0.58	2.27e-2	43.9	75
PLMA	IV	HH	0.36	8.84e-3	54.0	245

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.
(°)

SARM

EHZ

2.0736e-5

1.9943e-6

3.1883e-7

1.0845e-7

5.7795e-8

8.0899e-6

1.1360e-6

7.7126e-8

1.4522e-8

13.7

212

SARM

EHN

1.0881e-5

1.1511e-6

5.1920e-7

1.6251e-7

8.4624e-8

1.1897e-5

2.2773e-6

1.1342e-7

2.2291e-8

13.7

212

SARM

EHE

1.2703e-5

1.2105e-6

3.7946e-7

1.3145e-7

5.8549e-8

7.2614e-6

3.3507e-6

9.3393e-8

1.4450e-8

13.7

212

VLC

HHZ

8.8895e-6

1.1687e-6

3.2263e-7

9.2071e-8

4.2578e-8

1.2680e-5

1.0610e-6

6.6057e-8

1.6510e-8

15.4

210

VLC

HHN

7.0206e-6

1.0006e-6

3.3426e-7

8.1855e-8

5.3711e-8

1.3333e-5

1.1618e-6

8.8638e-8

1.6160e-8

15.4

210

VLC

HHE

4.0735e-6

6.1938e-7

2.4571e-7

6.5018e-8

3.5002e-8

9.0580e-6

8.6934e-7

6.5338e-8

1.4315e-8

15.4

210

GSCL

HHZ

6.0264e-6

1.0782e-6

7.0685e-7

3.0867e-7

1.6899e-7

1.9872e-5

3.9118e-6

1.8559e-7

2.1534e-8

18.3

GSCL

HHN

1.3516e-5

3.1095e-6

1.9712e-6

5.8288e-7

2.9364e-7

3.2050e-5

9.2475e-6

4.7624e-7

8.4190e-8

18.3

GSCL

HHE

1.0724e-5

2.6346e-6

1.9763e-6

7.9544e-7

4.0354e-7

2.3792e-5

1.1493e-5

5.7107e-7

8.5227e-8

18.3

VGL

HGZ

2.3528e-5

2.4896e-6

1.0108e-6

3.7169e-7

2.0813e-7

3.2746e-5

4.5771e-6

2.6965e-7

4.4037e-8

22.9

221

VGL

HGN

1.8702e-5

2.5597e-6

1.7945e-6

7.3656e-7

3.4009e-7

4.5023e-5

6.0735e-6

3.5568e-7

6.3038e-8

22.9

221

VGL

HGE

1.2192e-5

2.0660e-6

1.3904e-6

5.6759e-7

2.9746e-7

3.3171e-5

8.3957e-6

3.9186e-7

4.9342e-8

22.9

221

CARD

HHZ

8.5625e-6

1.0705e-6

2.8696e-7

7.7796e-8

4.4048e-8

1.7051e-5

1.7550e-6

7.7125e-8

2.1375e-8

26.9

176

CARD

HHN

9.5933e-6

1.0985e-6

5.6014e-7

1.4593e-7

9.3296e-8

1.9957e-5

1.6673e-6

1.5626e-7

2.4644e-8

26.9

176

CARD

HHE

9.6434e-6

1.4659e-6

6.3114e-7

1.4917e-7

8.4910e-8

2.5057e-5

1.7995e-6

1.5712e-7

3.5402e-8

26.9

176

EQUI

HHZ

1.6843e-6

2.6643e-7

1.2725e-7

5.4931e-8

2.4171e-8

3.8029e-6

6.3910e-7

3.5041e-8

6.6710e-9

27.9

249

EQUI

HHN

1.4347e-6

2.6035e-7

1.7200e-7

8.0756e-8

3.3421e-8

3.3311e-6

1.1539e-6

4.1226e-8

6.4919e-9

27.9

249

EQUI

HHE

2.3225e-6

2.5120e-7

1.1584e-7

6.1722e-8

3.1015e-8

2.5644e-6

4.2633e-7

3.5752e-8

6.1456e-9

27.9

249

FIVI

HNZ

2.0798e-5

1.4420e-6

4.7534e-7

2.2266e-7

1.3320e-7

1.0956e-5

1.8788e-6

1.8883e-7

2.0786e-8

28.2

267

FIVI

HNN

1.0925e-5

8.5989e-7

6.3171e-7

2.8929e-7

1.4875e-7

1.1582e-5

2.4637e-6

2.2838e-7

2.0185e-8

28.2

267

FIVI

HNE

1.5699e-5

8.5528e-7

4.4405e-7

2.6267e-7

1.4979e-7

8.6362e-6

2.0509e-6

2.3446e-7

1.6331e-8

28.2

267

POPM

HHZ

2.4335e-6

3.5346e-7

2.7423e-7

8.4817e-8

4.2358e-8

6.5757e-6

1.7201e-6

6.0217e-8

9.9938e-9

34.5

134

POPM

HHN

2.8029e-6

5.8629e-7

4.5166e-7

1.5887e-7

6.7877e-8

7.7722e-6

2.3144e-6

9.8973e-8

1.6784e-8

34.5

134

POPM

HHE

2.5288e-6

5.7936e-7

4.5243e-7

1.5837e-7

6.4270e-8

7.3671e-6

2.4179e-6

8.6711e-8

1.4004e-8

34.5

134

CRR

HNZ

3.9787e-6

8.6769e-7

5.1737e-7

4.4479e-7

2.2611e-7

1.3369e-5

1.8642e-6

2.3783e-7

2.2404e-8

34.8

238

CRR

HNN

1.0925e-5

2.1152e-6

1.0341e-6

7.0614e-7

4.4175e-7

3.3564e-5

3.0317e-6

5.2108e-7

5.1174e-8

34.8

238

CRR

HNE

7.2509e-6

1.0906e-6

7.3631e-7

4.4093e-7

2.3604e-7

2.4954e-5

4.8891e-6

3.1415e-7

2.9001e-8

34.8

238

MAIM

HHZ

4.3659e-7

8.2662e-8

6.5377e-8

3.6056e-8

1.5662e-8

1.3153e-6

4.2810e-7

2.0598e-8

2.5356e-9

38.8

176

MAIM

HHN

9.9126e-7

1.5796e-7

1.3766e-7

7.1191e-8

2.9619e-8

2.3598e-6

8.4827e-7

3.4457e-8

4.8044e-9

38.8

176

MAIM

HHE

7.9260e-7

1.5839e-7

1.0210e-7

6.0116e-8

2.7273e-8

2.8207e-6

5.2840e-7

2.7260e-8

4.1290e-9

38.8

176

ZCCA

HHZ

4.0839e-7

7.2857e-8

5.5564e-8

3.2419e-8

1.5442e-8

8.5553e-7

2.8526e-7

2.3517e-8

1.6680e-9

43.9

ZCCA

HHN

5.9781e-7

1.4206e-7

1.4188e-7

9.9771e-8

3.3576e-8

7.1742e-7

7.4277e-7

4.3026e-8

4.7624e-9

43.9

ZCCA

HHE

4.0353e-7

1.8348e-7

1.5635e-7

8.8132e-8

4.0432e-8

1.2434e-6

9.1160e-7

5.6877e-8

5.8181e-9

43.9

PLMA

HHZ

4.5085e-7

8.6875e-8

5.1963e-8

4.5679e-8

2.0791e-8

1.4752e-6

3.0443e-7

2.3402e-8

2.0204e-9

54.0

245

PLMA

HHN

9.8032e-7

1.5385e-7

8.9129e-8

5.1808e-8

2.3005e-8

2.9463e-6

4.1586e-7

2.5402e-8

3.5178e-9

54.0

245

PLMA

HHE

9.3419e-7

1.2095e-7

6.1661e-8

4.4081e-8

2.4807e-8

3.2142e-6

2.2704e-7

2.1696e-8

3.2592e-9

54.0

245

*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)

MANUAL Location - Area: Frignano , magnitude (ML): 0.6 2026-04-16 20:50:41 (UTC)

MANUAL Location - Area: Frignano , magnitude (M_L): 0.6
2026-04-16 20:50:41 (UTC)