RSNI - Manually revised location

MANUAL Location - Area: Lunigiana , magnitude (M_L): 0.9
2025-07-31 20:56:08 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-08-01 08:27:24

Earthquake info - Manual location

Event - ID :	250731205456
Magnitude (M_L) :	0.9 +/- 0.2
Origin Time :	2025-07-31 20:56:08.684 (UTC)
Location :	Latitude: 44.259 N, Longitude: 10.070 E
Area :	Lunigiana
Depth (km) :	8.63
Distances (km) :	2.6 --- Licciana Nardi 4.9 --- Fivizzano 6.0 --- Comano 8.8 --- Bagnone 9.5 --- Aulla 10.0 --- Tresana 10.2 --- Villafranca in Lunigiana 10.5 --- Casola in Lunigiana 11.6 --- Podenzana 13.4 --- Filattiera 14.2 --- Fosdinovo 14.7 --- Minucciano 15.0 --- Giuncugnano 15.7 --- Mulazzo 15.9 --- Bolano 16.4 --- Santo Stefano di Magra 17.7 --- Monchio delle Corti 18.1 --- Castelnuovo Magra 18.5 --- Sarzana 18.7 --- Calice al Cornoviglio

Quality location estimate: Erh: 0.8 km, Erz: 0.5 km, Nf: 26, Gap: 77 °, 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.
FIVI	GU	2025-07-31 20:56:10.848	0.020	0	0.10	1.33	2025-07-31 20:56:12.110	0.040	0	-0.07	1.51	10.3
AUL	IT	2025-07-31 20:56:11.409	0.020	0	0.15	0.94	2025-07-31 20:56:12.440	0.040	0	-0.65	0.49	12.8
EQUI	GU	2025-07-31 20:56:11.766	0.020	0	0.03	1.75	2025-07-31 20:56:13.880	0.040	0	-0.01	1.73	15.2
GRAM	GU	2025-07-31 20:56:14.128	0.020	0	0.40	0.02	2025-07-31 20:56:17.924	0.040	0	0.82	0.00	27.5
VLC	MN	2025-07-31 20:56:14.170	0.020	0	0.04	1.72	2025-07-31 20:56:18.126	0.040	0	-0.00	1.56	29.0
SARM	GU	2025-07-31 20:56:14.300	0.020	0	-0.17	0.70	2025-07-31 20:56:18.235	0.040	0	-0.48	0.49	29.3
PLMA	IV	2025-07-31 20:56:14.349	0.020	0	-0.02	1.73	2025-07-31 20:56:17.965	0.040	0	-0.60	0.53	30.2
CME	IT	2025-07-31 20:56:15.968	0.020	0	-0.08	1.43	2025-07-31 20:56:20.811	0.040	0	-0.65	0.47	39.6
BVT	IT	2025-07-31 20:56:16.330	0.020	0	-0.07	1.46	2025-07-31 20:56:21.892	0.040	0	0.05	1.34	40.9
CARD	GU	2025-07-31 20:56:16.461	0.020	0	0.14	1.05	2025-07-31 20:56:21.899	0.040	0	-0.02	1.36	42.8
GSCL	GU	2025-07-31 20:56:16.935	0.020	0	-0.43	0.41	2025-07-31 20:56:22.868	0.040	0	-0.93	0.11	43.5
MSSA	IV	2025-07-31 20:56:16.930	0.020	0	-0.06	1.51	2025-07-31 20:56:22.669	0.040	0	-0.56	0.51	45.4
MAIM	GU	2025-07-31 20:56:18.021	0.020	0	0.10	1.33	2025-07-31 20:56:24.274	0.040	0	-0.48	0.51	51.9

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
FIVI	GU	HN	1.42	2.27e+0	10.3	115
GRAM	GU	HH	0.78	1.59e-1	27.5	359
SARM	GU	EH	0.71	7.97e-2	29.3	107
PLMA	IV	HH	0.77	7.02e-2	30.2	217
CME	IT	HN	1.19	1.13e-1	39.6	151
BVT	IT	HN	0.90	5.38e-2	40.9	319
CARD	GU	HH	0.97	5.81e-2	42.8	128
MAIM	GU	HH	0.71	1.95e-2	51.9	139

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.
(°)

FIVI

HNZ

2.3756e-4

3.5585e-5

1.3480e-5

3.3828e-6

2.1467e-6

9.1027e-4

4.5571e-5

3.6020e-6

7.2999e-7

10.3

115

FIVI

HNN

2.0887e-4

3.2686e-5

1.8197e-5

4.6819e-6

3.0668e-6

5.9187e-4

9.5130e-5

5.2011e-6

9.3257e-7

10.3

115

FIVI

HNE

2.4862e-4

3.5821e-5

1.4002e-5

3.5598e-6

2.1409e-6

1.0908e-3

4.8875e-5

3.9345e-6

8.5457e-7

10.3

115

EQUI

HHZ

3.7992e-5

4.4001e-6

5.8280e-7

2.3154e-7

1.0434e-7

1.4898e-5

2.2848e-6

1.7311e-7

3.0657e-8

15.2

147

EQUI

HHN

2.0850e-5

2.1935e-6

7.5243e-7

2.8276e-7

1.4804e-7

2.6985e-5

2.8965e-6

2.5728e-7

5.3844e-8

15.2

147

EQUI

HHE

3.3534e-5

3.4359e-6

7.3449e-7

2.5325e-7

1.3554e-7

3.2930e-5

3.2841e-6

2.6863e-7

7.2314e-8

15.2

147

GRAM

HHZ

1.8672e-5

1.5284e-6

4.5778e-7

1.4253e-7

6.7085e-8

1.0648e-5

1.6405e-6

9.1378e-8

1.8411e-8

27.5

359

GRAM

HHN

8.2587e-6

1.2213e-6

9.0099e-7

3.8569e-7

1.5346e-7

1.9308e-5

4.7965e-6

2.2521e-7

3.4240e-8

27.5

359

GRAM

HHE

1.0302e-5

1.9991e-6

1.3003e-6

3.7577e-7

1.9728e-7

1.9773e-5

7.9835e-6

2.9227e-7

4.9502e-8

27.5

359

VLC

HHZ

3.2069e-6

5.1024e-7

1.6553e-7

6.1074e-8

2.7191e-8

4.0870e-6

9.5604e-7

4.5945e-8

8.3964e-9

29.0

114

VLC

HHN

4.6442e-6

5.1257e-7

2.4338e-7

7.8429e-8

4.2757e-8

8.6805e-6

1.4916e-6

5.8503e-8

1.0119e-8

29.0

114

VLC

HHE

4.3865e-6

7.6003e-7

2.3515e-7

7.1965e-8

3.5100e-8

1.1983e-5

9.5499e-7

6.5148e-8

1.3694e-8

29.0

114

SARM

EHZ

2.9461e-6

7.4167e-7

4.2788e-7

1.5925e-7

6.8340e-8

5.2526e-6

3.9339e-6

9.1915e-8

1.4021e-8

29.3

107

SARM

EHN

3.6465e-6

7.4530e-7

6.5768e-7

3.9530e-7

1.5463e-7

8.2716e-6

4.0778e-6

2.1018e-7

2.3237e-8

29.3

107

SARM

EHE

4.3259e-6

4.5827e-7

3.9812e-7

1.5104e-7

6.4171e-8

1.1543e-5

3.3735e-6

9.5267e-8

1.3740e-8

29.3

107

PLMA

HHZ

6.6447e-6

5.1280e-7

1.7458e-7

8.1604e-8

5.8743e-8

5.9955e-6

1.1513e-6

8.5095e-8

1.0887e-8

30.2

217

PLMA

HHN

7.1518e-6

1.2922e-6

5.9683e-7

1.7499e-7

1.0674e-7

1.9664e-5

3.0400e-6

1.5600e-7

2.9586e-8

30.2

217

PLMA

HHE

6.5846e-6

7.8562e-7

2.9113e-7

8.8123e-8

5.3767e-8

1.4362e-5

1.0419e-6

7.8768e-8

1.5829e-8

30.2

217

CME

HNZ

6.8601e-6

1.0970e-6

5.5102e-7

3.1253e-7

1.6576e-7

1.8497e-5

1.8088e-6

2.1405e-7

2.6545e-8

39.6

151

CME

HNN

8.7661e-6

1.4086e-6

9.3684e-7

4.3309e-7

2.1115e-7

1.7992e-5

5.0707e-6

2.5638e-7

3.8290e-8

39.6

151

CME

HNE

1.0164e-5

1.6788e-6

1.0924e-6

3.0831e-7

2.0016e-7

2.4785e-5

5.8076e-6

2.4072e-7

3.8880e-8

39.6

151

BVT

HNZ

4.4844e-6

5.6393e-7

3.1924e-7

2.6561e-7

1.5783e-7

4.0316e-6

1.4645e-6

1.8948e-7

1.3434e-8

40.9

319

BVT

HNN

3.9630e-6

4.7617e-7

4.0455e-7

2.1937e-7

1.2511e-7

6.2573e-6

2.3580e-6

2.2247e-7

1.3526e-8

40.9

319

BVT

HNE

2.8316e-6

6.1093e-7

4.4186e-7

2.9051e-7

1.7742e-7

1.1706e-5

1.5659e-6

2.1622e-7

1.8424e-8

40.9

319

CARD

HHZ

5.9312e-6

7.5994e-7

3.2141e-7

7.2908e-8

4.3638e-8

2.5086e-5

1.1092e-6

7.8990e-8

1.6799e-8

42.8

128

CARD

HHN

1.1097e-5

1.1411e-6

4.7744e-7

1.0025e-7

6.0219e-8

2.1258e-5

1.3274e-6

1.1067e-7

2.4974e-8

42.8

128

CARD

HHE

1.1079e-5

1.5863e-6

5.1750e-7

1.1726e-7

6.3475e-8

2.1335e-5

1.6961e-6

1.1796e-7

3.0532e-8

42.8

128

GSCL

HHZ

5.8250e-7

1.3401e-7

7.6319e-8

3.3098e-8

1.6559e-8

1.5327e-6

2.4025e-7

2.2798e-8

3.2341e-9

43.5

GSCL

HHN

9.8448e-7

2.5174e-7

2.1196e-7

9.0617e-8

6.5752e-8

2.9491e-6

1.1444e-6

1.1219e-7

9.4184e-9

43.5

GSCL

HHE

7.3757e-7

2.2636e-7

2.1116e-7

1.0296e-7

6.4353e-8

2.2202e-6

1.3295e-6

9.6238e-8

7.1971e-9

43.5

MSSA

HHZ

6.7525e-7

1.0008e-7

5.4517e-8

2.2472e-8

1.6924e-8

2.1204e-6

2.1584e-7

2.3156e-8

2.1406e-9

45.4

278

MSSA

HHN

9.6974e-7

1.1043e-7

6.9378e-8

2.3413e-8

1.6714e-8

2.6010e-6

3.2007e-7

2.2541e-8

2.7392e-9

45.4

278

MSSA

HHE

7.2227e-7

1.0080e-7

6.7568e-8

2.9158e-8

1.5263e-8

1.7535e-6

2.3264e-7

2.1325e-8

2.3456e-9

45.4

278

MAIM

HHZ

2.0205e-6

2.3191e-7

1.1345e-7

5.0293e-8

2.3389e-8

2.9982e-6

5.1024e-7

2.9994e-8

4.9960e-9

51.9

139

MAIM

HHN

2.5790e-6

2.7715e-7

1.5492e-7

6.2535e-8

2.6455e-8

7.2683e-6

5.8942e-7

3.3980e-8

6.6036e-9

51.9

139

MAIM

HHE

2.1063e-6

3.0861e-7

1.5905e-7

7.1349e-8

2.9364e-8

4.1465e-6

6.4740e-7

4.1423e-8

7.4248e-9

51.9

139

*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: Lunigiana , magnitude (ML): 0.9 2025-07-31 20:56:08 (UTC)

MANUAL Location - Area: Lunigiana , magnitude (M_L): 0.9
2025-07-31 20:56:08 (UTC)