RSNI - Manually revised location

MANUAL Location - Area: Alpi Cozie , magnitude (M_L): -0.0
2025-08-08 16:41:08 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-08-09 15:19:10

Earthquake info - Manual location

Event - ID :	250808164017
Magnitude (M_L) :	-0.0 +/- 0.2
Origin Time :	2025-08-08 16:41:08.735 (UTC)
Location :	Latitude: 44.548 N, Longitude: 6.806 E
Area :	Alpi Cozie
Depth (km) :	7.27
Distances (km) :	16.6 --- Acceglio 17.1 --- Bellino 19.4 --- Pontechianale 19.8 --- Argentera 21.0 --- Prazzo 21.4 --- Casteldelfino 22.5 --- Elva 24.1 --- Canosio 24.9 --- Marmora 25.8 --- Stroppo 28.9 --- Pietraporzio 30.0 --- Macra 30.5 --- Celle di Macra 30.6 --- Sampeyre 31.5 --- Sambuco 32.5 --- Crissolo 33.6 --- Oncino 34.3 --- Ostana 35.7 --- Castelmagno 36.2 --- San Damiano Macra

Quality location estimate: Erh: 1.1 km, Erz: 0.5 km, Nf: 10, Gap: 182 °, Rms: 0.11

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.
SURF	FR	2025-08-08 16:41:11.530	0.006	0	0.34	0.09	2025-08-08 16:41:13.000	0.021	0	-0.02	1.80	10.5
PZZ	GU	2025-08-08 16:41:14.130	0.012	0	0.01	1.80	2025-08-08 16:41:17.209	0.060	1	-0.80	0.06	26.5
RRL	GU	2025-08-08 16:41:16.891	0.020	0	0.04	1.53	2025-08-08 16:41:22.249	0.040	0	-0.35	0.36	42.5
ISO	FR	2025-08-08 16:41:17.183	0.020	0	-0.10	1.22	2025-08-08 16:41:23.200	0.040	0	0.10	1.13	45.6
BHB	GU	2025-08-08 16:41:17.814	0.020	0	0.01	1.60	2025-08-08 16:41:23.760	0.147	4	-0.42	0.42	48.8

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
PZZ	GU	HH	0.17	3.93e-2	26.5	101
RRL	GU	HH	-0.11	3.31e-3	42.5	358
ISO	FR	HH	-0.25	3.06e-3	45.6	154
BHB	GU	HH	0.02	4.55e-3	48.8	48

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

2.9313e-6

3.5122e-7

1.6138e-7

3.7613e-8

1.9101e-8

7.4720e-6

7.2161e-7

3.1847e-8

8.0043e-9

26.5

101

PZZ

HHN

4.3748e-6

5.7526e-7

3.2823e-7

8.6537e-8

4.9116e-8

7.4141e-6

1.5096e-6

7.7888e-8

1.3136e-8

26.5

101

PZZ

HHE

4.6621e-6

7.5841e-7

2.4649e-7

5.9173e-8

3.2956e-8

9.3102e-6

1.0459e-6

5.3326e-8

1.5663e-8

26.5

101

RRL

HHZ

3.5477e-7

4.4412e-8

2.0014e-8

9.9259e-9

4.5925e-9

5.1482e-7

8.5552e-8

9.0177e-9

8.7299e-10

42.5

358

RRL

HHN

2.8848e-7

4.1184e-8

3.0115e-8

1.1364e-8

5.3329e-9

9.5956e-7

1.5431e-7

7.7451e-9

1.0816e-9

42.5

358

RRL

HHE

2.7463e-7

4.6805e-8

3.1944e-8

1.2105e-8

5.9089e-9

7.4891e-7

1.1973e-7

8.3484e-9

1.2897e-9

42.5

358

ISO

HHZ

4.8337e-7

5.8467e-8

2.1452e-8

5.2293e-9

3.0831e-9

9.6285e-7

8.9366e-8

4.8988e-9

1.1537e-9

45.6

154

ISO

HHN

3.8594e-7

4.6420e-8

1.8433e-8

6.0184e-9

3.9729e-9

4.9933e-7

6.8877e-8

5.9881e-9

9.2525e-10

45.6

154

ISO

HHE

4.9549e-7

6.2162e-8

2.4495e-8

9.8087e-9

8.8848e-9

9.2014e-7

8.9374e-8

1.5667e-8

1.4999e-9

45.6

154

BHB

HHZ

7.0089e-7

9.5026e-8

4.4080e-8

1.2329e-8

7.2871e-9

1.4933e-6

1.2813e-7

1.2681e-8

2.1946e-9

48.8

BHB

HHN

6.6506e-7

7.4438e-8

4.3660e-8

1.2720e-8

5.9078e-9

1.5904e-6

1.9832e-7

9.1991e-9

1.6884e-9

48.8

BHB

HHE

5.9850e-7

8.6784e-8

3.2800e-8

1.1620e-8

5.6817e-9

1.5348e-6

1.2999e-7

9.1134e-9

1.7852e-9

48.8

*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): -0.0 2025-08-08 16:41:08 (UTC)

MANUAL Location - Area: Alpi Cozie , magnitude (M_L): -0.0
2025-08-08 16:41:08 (UTC)