RSNI - Manually revised location

MANUAL Location - Area: Riviera di ponente , magnitude (M_L): -0.1
2025-04-28 07:13:50 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-04-28 08:12:52

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Earthquake info - Manual location

Event - ID :	250428071147
Magnitude (M_L) :	-0.1 +/- 0.2
Origin Time :	2025-04-28 07:13:50.458 (UTC)
Location :	Latitude: 43.789 N, Longitude: 7.404 E
Area :	Riviera di ponente
Depth (km) :	2.26
Distances (km) :	13.6 --- Olivetta San Michele 15.2 --- Airole 16.4 --- Ventimiglia 18.2 --- Camporosso 19.0 --- Vallecrosia 19.0 --- Dolceacqua 19.5 --- Rocchetta Nervina 20.0 --- San Biagio della Cima 20.6 --- Soldano 20.7 --- Bordighera 21.2 --- Vallebona 21.5 --- Isolabona 22.9 --- Apricale 22.9 --- Perinaldo 23.7 --- Seborga 25.2 --- Ospedaletti 26.3 --- Pigna 26.7 --- Castel Vittorio 28.5 --- Baiardo 29.9 --- San Remo

Quality location estimate: Erh: 0.9 km, Erz: 0.8 km, Nf: 10, Gap: 252 °, Rms: 0.09

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	2025-04-28 07:13:52.390	0.001	0	0.05	1.43	2025-04-28 07:13:53.620	0.015	0	-0.04	1.46	5.9
TURF	FR	2025-04-28 07:13:55.580	0.013	0	0.22	0.24	2025-04-28 07:13:58.980	0.061	1	0.04	1.34	20.8
MVIF	FR	2025-04-28 07:13:56.022	0.020	0	0.01	1.62	2025-04-28 07:13:59.697	0.040	0	-0.39	0.19	23.5
SAOF	FR	2025-04-28 07:13:56.567	0.020	0	-0.03	1.50	2025-04-28 07:14:01.125	0.040	0	0.05	1.29	25.3
MGRO	GU	2025-04-28 07:13:59.477	0.120	5	-0.17	0.77	2025-04-28 07:14:05.887	0.130	3	-0.59	0.15	43.1

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
ESCA	FR	HH	0.13	3.05e-1	5.9	333
TURF	FR	HH	-0.25	1.39e-2	20.8	357
SAOF	FR	HH	-0.31	8.43e-3	25.3	29
MGRO	GU	HH	0.09	7.66e-3	43.1	49

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

2.2387e-5

4.2063e-6

1.8139e-6

6.5354e-7

4.8699e-7

6.5439e-5

6.4949e-6

6.6063e-7

1.0745e-7

5.9

333

ESCA

HHN

3.3578e-5

5.6053e-6

2.3584e-6

1.1722e-6

6.3142e-7

9.0975e-5

8.6827e-6

8.3848e-7

1.2135e-7

5.9

333

ESCA

HHE

2.5744e-5

3.5569e-6

1.8603e-6

6.7522e-7

3.0588e-7

7.1494e-5

5.6809e-6

4.7946e-7

8.7763e-8

5.9

333

TURF

HHZ

7.2557e-7

1.3751e-7

9.7112e-8

5.1077e-8

2.8083e-8

1.1664e-6

4.8174e-7

4.1754e-8

3.0293e-9

20.8

357

TURF

HHN

6.1790e-7

1.4018e-7

1.3634e-7

5.1459e-8

2.4746e-8

1.9383e-6

6.0869e-7

3.6083e-8

4.4432e-9

20.8

357

TURF

HHE

7.3976e-7

1.8454e-7

1.2402e-7

6.0633e-8

3.0367e-8

2.4463e-6

6.3721e-7

3.4464e-8

4.3651e-9

20.8

357

SAOF

HHZ

2.3103e-7

5.4195e-8

5.0198e-8

2.4956e-8

1.2172e-8

5.2090e-7

2.8885e-7

1.6146e-8

1.4987e-9

25.3

SAOF

HHN

2.6953e-7

6.8755e-8

4.7163e-8

4.4134e-8

3.6266e-8

7.4060e-7

1.9171e-7

4.5842e-8

6.1037e-9

25.3

SAOF

HHE

3.4434e-7

4.8326e-8

3.2205e-8

1.9191e-8

1.2475e-8

7.7112e-7

1.3309e-7

1.6009e-8

1.4407e-9

25.3

MGRO

HHZ

1.8408e-7

2.7750e-8

2.1811e-8

1.7556e-8

9.9683e-9

3.6139e-7

1.0495e-7

1.1960e-8

1.0957e-9

43.1

MGRO

HHN

1.8957e-7

4.9674e-8

3.8011e-8

3.6886e-8

3.3440e-8

4.3672e-7

1.8130e-7

6.0013e-8

6.7409e-9

43.1

MGRO

HHE

2.0364e-7

4.4857e-8

3.5561e-8

2.2601e-8

1.1766e-8

5.8507e-7

1.8961e-7

1.3821e-8

1.5194e-9

43.1

*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: Riviera di ponente , magnitude (ML): -0.1 2025-04-28 07:13:50 (UTC)

MANUAL Location - Area: Riviera di ponente , magnitude (M_L): -0.1
2025-04-28 07:13:50 (UTC)