RSNI - Manually revised location

MANUAL Location - Area: Alpi Cozie , magnitude (M_L): 0.3
2025-07-27 05:05:33 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-07-28 08:52:04

Earthquake info - Manual location

Event - ID :	250727050438
Magnitude (M_L) :	0.3 +/- 0.2
Origin Time :	2025-07-27 05:05:33.987 (UTC)
Location :	Latitude: 44.523 N, Longitude: 7.238 E
Area :	Alpi Cozie
Depth (km) :	11.77
Distances (km) :	3.9 --- San Damiano Macra 5.3 --- Macra 6.3 --- Cartignano 6.3 --- Frassino 6.4 --- Celle di Macra 7.3 --- Sampeyre 7.9 --- Melle 8.9 --- Valmala 9.0 --- Stroppo 9.6 --- Roccabruna 11.1 --- Brossasco 11.6 --- Dronero 11.9 --- Pradleves 11.9 --- Elva 12.1 --- Villar San Costanzo 12.7 --- Castelmagno 13.3 --- Venasca 13.4 --- Marmora 13.5 --- Isasca 14.2 --- Monterosso Grana

Quality location estimate: Erh: 0.7 km, Erz: 0.7 km, Nf: 20, Gap: 119 °, Rms: 0.16

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.
PZZ	GU	2025-07-27 05:05:37.480	0.009	0	0.35	0.06	2025-07-27 05:05:39.390	0.054	1	0.01	1.72	16.4
VIND	IV	2025-07-27 05:05:39.035	0.020	0	-0.01	1.80	2025-07-27 05:05:42.078	0.040	0	-0.53	0.52	26.9
STV	GU	2025-07-27 05:05:40.210	0.018	0	0.09	1.26	2025-07-27 05:05:43.980	0.105	3	-0.40	0.69	34.0
SURF	FR	2025-07-27 05:05:40.870	0.019	0	0.03	1.67	2025-07-27 05:05:45.370	0.111	3	-0.48	0.60	36.0
BHB	GU	2025-07-27 05:05:40.560	0.019	0	0.03	1.69	2025-07-27 05:05:44.640	0.114	3	-0.36	0.75	36.9
ENR	GU	2025-07-27 05:05:40.689	0.020	0	-0.05	1.64	2025-07-27 05:05:45.281	0.116	3	-0.15	1.17	37.9
ISO	FR	2025-07-27 05:05:42.357	0.020	0	0.67	0.00	2025-07-27 05:05:46.690	0.181	5	-0.25	0.97	42.4
RRL	GU	2025-07-27 05:05:44.319	0.020	0	-0.11	1.32	2025-07-27 05:05:51.390	0.219	6	-0.41	0.74	58.4
GBOS	GU	2025-07-27 05:05:44.060	0.030	1	-0.07	1.47	2025-07-27 05:05:49.973	0.040	0	-1.24	0.01	58.5
TURF	FR	2025-07-27 05:05:45.500	0.020	0	0.12	1.08	2025-07-27 05:05:53.230	0.287	7	-0.31	0.83	63.2

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
PZZ	GU	HH	0.40	1.61e-1	16.4	260
STV	GU	HH	0.38	1.58e-2	34.0	167
BHB	GU	HH	0.05	8.56e-3	36.9	3
ENR	GU	HH	0.74	6.08e-2	37.9	156
RRL	GU	HH	0.09	2.78e-3	58.4	322
GBOS	GU	HH	0.53	5.75e-3	58.5	123
TURF	FR	HH	0.09	3.44e-3	63.2	169

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.
(°)

PZZ

HHZ

1.7106e-5

1.9919e-6

1.0818e-6

3.6074e-7

2.0861e-7

4.1109e-5

5.3715e-6

3.1819e-7

4.9959e-8

16.4

260

PZZ

HHN

4.0579e-5

4.1884e-6

1.1723e-6

3.0604e-7

1.7425e-7

5.1555e-5

4.2149e-6

3.5972e-7

8.0024e-8

16.4

260

PZZ

HHE

1.5834e-5

2.0175e-6

1.0648e-6

4.0096e-7

1.9092e-7

3.3811e-5

4.9247e-6

2.8828e-7

4.2667e-8

16.4

260

STV

HHZ

2.2266e-6

2.6642e-7

1.2764e-7

3.7121e-8

2.3605e-8

5.2088e-6

4.8114e-7

3.4144e-8

5.9269e-9

34.0

167

STV

HHN

2.4141e-6

3.1535e-7

1.1452e-7

4.1613e-8

2.0338e-8

5.3974e-6

3.7718e-7

3.6843e-8

6.1113e-9

34.0

167

STV

HHE

1.7425e-6

2.2185e-7

1.2536e-7

4.3443e-8

2.3269e-8

5.3267e-6

5.0792e-7

3.6306e-8

5.3793e-9

34.0

167

BHB

HHZ

1.3367e-6

1.6788e-7

6.6434e-8

1.7943e-8

1.0102e-8

4.4580e-6

2.2903e-7

1.8353e-8

3.8813e-9

36.9

BHB

HHN

1.2197e-6

1.4654e-7

6.4618e-8

1.6539e-8

1.1992e-8

2.8966e-6

1.9999e-7

1.7347e-8

3.5060e-9

36.9

BHB

HHE

1.5524e-6

1.6752e-7

5.6965e-8

1.4281e-8

8.3365e-9

2.3871e-6

2.5811e-7

1.5873e-8

2.9152e-9

36.9

ENR

HHZ

8.1847e-6

7.3996e-7

3.1100e-7

7.2762e-8

4.0551e-8

1.2533e-5

1.1731e-6

6.5945e-8

1.2111e-8

37.9

156

ENR

HHN

1.4883e-5

1.3904e-6

4.0864e-7

1.3725e-7

5.2094e-8

2.3389e-5

1.9286e-6

1.1030e-7

2.5363e-8

37.9

156

ENR

HHE

2.6309e-5

2.5531e-6

3.5363e-7

1.2872e-7

8.1075e-8

1.7179e-5

1.2571e-6

1.6536e-7

3.7540e-8

37.9

156

ISO

HHZ

5.6876e-7

8.2750e-8

3.1683e-8

1.2696e-8

8.9689e-9

1.1290e-6

1.4429e-7

1.4906e-8

1.8041e-9

42.4

202

ISO

HHN

7.7918e-7

9.0379e-8

3.2726e-8

1.3289e-8

7.6164e-9

1.3755e-6

1.1504e-7

1.1895e-8

1.8791e-9

42.4

202

ISO

HHE

7.4300e-7

8.9316e-8

3.7861e-8

1.3183e-8

9.3355e-9

1.6706e-6

1.4529e-7

1.3890e-8

1.7537e-9

42.4

202

RRL

HHZ

4.3930e-7

3.4877e-8

1.4851e-8

8.4089e-9

6.9575e-9

5.6403e-7

8.1249e-8

1.0059e-8

8.1368e-10

58.4

322

RRL

HHN

5.4850e-7

4.4539e-8

2.4844e-8

1.0150e-8

6.8678e-9

9.3616e-7

1.1703e-7

1.0875e-8

1.2230e-9

58.4

322

RRL

HHE

5.3418e-7

5.5387e-8

2.3177e-8

9.8393e-9

8.7352e-9

1.0142e-6

1.2362e-7

1.5003e-8

1.0301e-9

58.4

322

GBOS

HHZ

3.5922e-7

7.4134e-8

2.6159e-8

1.0593e-8

8.1098e-9

8.8951e-7

1.0690e-7

1.4393e-8

1.2671e-9

58.5

123

GBOS

HHN

5.2296e-7

8.9259e-8

4.5727e-8

3.3928e-8

1.5711e-8

9.8534e-7

1.7994e-7

2.3931e-8

2.0422e-9

58.5

123

GBOS

HHE

4.3028e-7

6.7349e-8

2.3301e-8

1.0843e-8

1.0082e-8

7.7791e-7

7.8772e-8

1.6799e-8

1.3058e-9

58.5

123

TURF

HHZ

1.8707e-7

2.3865e-8

1.4799e-8

1.3849e-8

1.2717e-8

3.1971e-7

1.0026e-7

1.6979e-8

1.2292e-9

63.2

169

TURF

HHN

2.1501e-7

3.0656e-8

1.9190e-8

1.4727e-8

1.5858e-8

6.0190e-7

8.5612e-8

2.5459e-8

1.3624e-9

63.2

169

TURF

HHE

2.0041e-7

3.2562e-8

2.1236e-8

1.8182e-8

1.6981e-8

4.8583e-7

8.1981e-8

2.4812e-8

1.3977e-9

63.2

169

*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 Cozie , magnitude (ML): 0.3 2025-07-27 05:05:33 (UTC)

MANUAL Location - Area: Alpi Cozie , magnitude (M_L): 0.3
2025-07-27 05:05:33 (UTC)