RSNI - Manually revised location

MANUAL Location - Area: Alpi Marittime , magnitude (M_L): 0.1
2025-11-13 09:04:11 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-11-13 10:23:46

Earthquake info - Manual location

Event - ID :	251113090257
Magnitude (M_L) :	0.1 +/- 0.2
Origin Time :	2025-11-13 09:04:11.365 (UTC)
Location :	Latitude: 43.922 N, Longitude: 7.311 E
Area :	Alpi Marittime
Depth (km) :	13.74
Distances (km) :	17.1 --- Olivetta San Michele 20.2 --- Airole 23.4 --- Rocchetta Nervina 26.2 --- Dolceacqua 26.7 --- Isolabona 27.9 --- Ventimiglia 27.9 --- Camporosso 28.2 --- Apricale 28.2 --- Pigna 29.1 --- Castel Vittorio 29.1 --- Perinaldo 29.3 --- Soldano 29.4 --- San Biagio della Cima 30.3 --- Vallecrosia 30.9 --- Vallebona 32.0 --- Bordighera 32.4 --- Seborga 32.9 --- Baiardo 35.2 --- Ospedaletti 36.1 --- Entracque

Quality location estimate: Erh: 1.5 km, Erz: 0.8 km, Nf: 10, Gap: 105 °, Rms: 0.03

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.
ESCA	FR	2025-11-13 09:04:15.050	0.009	0	-0.01	2.31	2025-11-13 09:04:17.780	0.094	2	0.03	1.74	18.2
MVIF	FR	2025-11-13 09:04:12.460	0.003	0	-2.93	0.00	2025-11-13 09:04:13.398	0.011	0	-4.98	0.00	18.9
SAOF	FR	2025-11-13 09:04:16.766	0.020	0	0.02	2.30	2025-11-13 09:04:21.087	0.040	0	0.43	0.02	25.2
MLIG	IV	2025-11-13 09:04:18.429	0.020	0	0.02	2.16	2025-11-13 09:04:23.421	0.040	0	-0.07	1.47	33.6
ISO	FR	2025-11-13 09:04:16.849	0.020	0	-1.62	0.00	2025-11-13 09:04:21.170	0.040	0	-2.35	0.00	38.7

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
ESCA	FR	HH	0.18	4.72e-2	18.2	153
SAOF	FR	HH	-0.11	1.33e-2	25.2	70
ISO	FR	HH	0.30	1.51e-2	38.7	324

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.
(°)

ESCA

HHZ

1.2751e-6

3.3804e-7

2.3425e-7

2.3333e-7

8.6656e-8

3.3933e-6

8.8311e-7

1.0884e-7

8.8096e-9

18.2

153

ESCA

HHN

1.5378e-6

3.7056e-7

3.1125e-7

3.0721e-7

9.5311e-8

4.7039e-6

1.1014e-6

1.1609e-7

1.3750e-8

18.2

153

ESCA

HHE

1.4269e-6

3.1126e-7

3.1047e-7

2.1923e-7

9.5831e-8

3.4970e-6

1.4448e-6

1.2292e-7

9.5313e-9

18.2

153

SAOF

HHZ

4.2591e-7

1.1029e-7

7.9876e-8

8.4167e-8

4.0828e-8

1.1262e-6

3.0671e-7

5.2215e-8

3.6953e-9

25.2

SAOF

HHN

8.3557e-7

1.1687e-7

7.4915e-8

1.0397e-7

5.6201e-8

2.6249e-6

3.1306e-7

4.3686e-8

3.4252e-9

25.2

SAOF

HHE

4.5090e-7

9.5738e-8

7.8307e-8

8.2901e-8

4.6381e-8

1.8031e-6

3.8706e-7

4.7301e-8

3.6003e-9

25.2

ISO

HHZ

7.2524e-7

1.1838e-7

7.5555e-8

8.0742e-8

3.9419e-8

1.7649e-6

2.4344e-7

4.0744e-8

3.9049e-9

38.7

324

ISO

HHN

7.3946e-7

1.3672e-7

9.4553e-8

8.7669e-8

3.7570e-8

2.6113e-6

3.3300e-7

4.5743e-8

4.5810e-9

38.7

324

ISO

HHE

1.0148e-6

1.7988e-7

1.3419e-7

8.6364e-8

3.9819e-8

2.4216e-6

3.2377e-7

4.9996e-8

4.8610e-9

38.7

324

*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: Alpi Marittime , magnitude (ML): 0.1 2025-11-13 09:04:11 (UTC)

MANUAL Location - Area: Alpi Marittime , magnitude (M_L): 0.1
2025-11-13 09:04:11 (UTC)