RSNI - Manually revised location

MANUAL Location - Area: Alpi Cozie , magnitude (M_L): 0.6
2026-10-21 15:58:57 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2026-10-22 07:14:42

Earthquake info - Manual location

Event - ID :	261021155720
Magnitude (M_L) :	0.6 +/- 0.2
Origin Time :	2026-10-21 15:58:57.093 (UTC)
Location :	Latitude: 44.516 N, Longitude: 7.246 E
Area :	Alpi Cozie
Depth (km) :	15.52
Distances (km) :	3.0 --- San Damiano Macra 5.3 --- Cartignano 5.6 --- Macra 6.4 --- Celle di Macra 6.7 --- Frassino 7.8 --- Melle 8.3 --- Sampeyre 8.5 --- Valmala 8.7 --- Roccabruna 9.5 --- Stroppo 10.7 --- Dronero 11.0 --- Brossasco 11.0 --- Pradleves 11.3 --- Villar San Costanzo 12.1 --- Castelmagno 12.7 --- Elva 13.0 --- Venasca 13.3 --- Monterosso Grana 13.4 --- Isasca 13.5 --- Montemale di Cuneo

Quality location estimate: Erh: 0.8 km, Erz: 0.6 km, Nf: 20, Gap: 120 °, Rms: 0.25

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	2026-10-21 15:59:00.700	0.009	0	-0.04	1.68	2026-10-21 15:59:02.389	0.040	0	-0.97	0.20	19.9
PONC	IV	2026-10-21 15:59:02.093	0.020	0	0.06	1.71	2026-10-21 15:59:05.057	0.040	0	-0.51	0.68	27.5
VIND	IV	2026-10-21 15:59:02.282	0.020	0	-0.02	1.84	2026-10-21 15:59:05.217	0.040	0	-0.75	0.49	28.3
STV	GU	2026-10-21 15:59:03.266	0.020	0	0.01	1.86	2026-10-21 15:59:07.110	0.088	2	-0.47	0.66	34.9
SURF	FR	2026-10-21 15:59:04.260	0.019	0	0.08	1.54	2026-10-21 15:59:08.870	0.101	3	-0.49	0.67	37.9
ENR	GU	2026-10-21 15:59:03.970	0.019	0	0.14	1.00	2026-10-21 15:59:08.060	0.101	3	-0.51	0.68	38.5
BHB	GU	2026-10-21 15:59:03.836	0.020	0	-0.01	1.80	2026-10-21 15:59:07.844	0.040	0	-0.67	0.63	39.0
ISO	FR	2026-10-21 15:59:05.432	0.020	0	0.59	0.04	2026-10-21 15:59:10.110	0.150	4	-0.05	1.12	43.3
GBOS	GU	2026-10-21 15:59:07.280	0.332	9	0.14	0.76	2026-10-21 15:59:14.055	0.214	6	-0.20	0.92	58.6
RRL	GU	2026-10-21 15:59:07.717	0.020	0	-0.06	1.37	2026-10-21 15:59:14.372	0.040	0	-0.93	0.35	60.3

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
PZZ	GU	HH	0.51	1.46e-1	19.9	264
PONC	IV	HH	0.85	1.04e-1	27.5	305
STV	GU	HH	0.63	2.71e-2	34.9	168
ENR	GU	HH	1.03	1.14e-1	38.5	157
BHB	GU	HH	0.37	1.62e-2	39.0	2
ISO	FR	HH	0.29	1.19e-2	43.3	203
RRL	GU	HH	0.67	9.93e-3	60.3	322

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

2.0496e-5

2.9016e-6

1.1692e-6

2.4389e-7

1.3923e-7

2.8909e-5

6.2537e-6

2.5773e-7

5.7791e-8

19.9

264

PZZ

HHN

1.7031e-5

2.7860e-6

1.1199e-6

3.6408e-7

2.0012e-7

3.2387e-5

4.3704e-6

3.2867e-7

5.7136e-8

19.9

264

PZZ

HHE

1.7908e-5

2.5306e-6

1.2293e-6

3.4195e-7

1.9323e-7

2.9978e-5

4.8133e-6

2.9691e-7

5.1813e-8

19.9

264

PONC

HHZ

3.8413e-5

4.6761e-6

1.3090e-6

3.8627e-7

1.9901e-7

5.9551e-5

5.6414e-6

4.1725e-7

1.0011e-7

27.5

305

PONC

HHN

3.3167e-5

3.4333e-6

5.9572e-7

1.5816e-7

9.9190e-8

3.8344e-5

2.0438e-6

2.3664e-7

6.7232e-8

27.5

305

PONC

HHE

1.3073e-5

1.7253e-6

6.6055e-7

2.2169e-7

1.2122e-7

1.5410e-5

3.1690e-6

2.1327e-7

4.0004e-8

27.5

305

STV

HHZ

4.5244e-6

3.9045e-7

1.9159e-7

7.0550e-8

3.6283e-8

4.7212e-6

1.0999e-6

4.9095e-8

7.8037e-9

34.9

168

STV

HHN

4.5030e-6

4.6565e-7

1.5356e-7

5.1562e-8

2.7591e-8

6.4204e-6

8.9597e-7

4.5783e-8

8.9636e-9

34.9

168

STV

HHE

6.7082e-6

6.7630e-7

1.8373e-7

5.3659e-8

3.4654e-8

8.2697e-6

7.4078e-7

6.7977e-8

1.5340e-8

34.9

168

ENR

HHZ

1.4814e-5

1.6651e-6

4.6112e-7

2.2362e-7

1.0671e-7

2.9057e-5

1.4628e-6

1.4472e-7

2.9486e-8

38.5

157

ENR

HHN

3.4787e-5

3.2502e-6

7.6418e-7

3.1218e-7

1.4175e-7

4.8433e-5

2.3000e-6

3.0578e-7

6.8676e-8

38.5

157

ENR

HHE

3.9574e-5

3.4298e-6

6.0116e-7

1.8136e-7

9.4851e-8

2.8266e-5

2.6094e-6

1.9944e-7

5.9392e-8

38.5

157

BHB

HHZ

3.8581e-6

4.5886e-7

1.4232e-7

4.1896e-8

1.9973e-8

8.6858e-6

5.6398e-7

3.5556e-8

9.0646e-9

39.0

BHB

HHN

2.6613e-6

3.1523e-7

1.3426e-7

3.7779e-8

1.9983e-8

5.8444e-6

5.8780e-7

3.9286e-8

6.8565e-9

39.0

BHB

HHE

2.5479e-6

2.7957e-7

1.1448e-7

4.2912e-8

2.1378e-8

3.0993e-6

5.0700e-7

3.3634e-8

5.8539e-9

39.0

ISO

HHZ

1.8679e-6

2.5743e-7

1.0568e-7

3.1818e-8

1.7617e-8

4.4001e-6

5.5482e-7

2.6647e-8

5.9097e-9

43.3

203

ISO

HHN

3.1661e-6

3.6051e-7

7.2560e-8

2.5705e-8

1.8424e-8

3.4534e-6

3.5023e-7

3.6398e-8

6.2504e-9

43.3

203

ISO

HHE

3.1769e-6

3.5695e-7

7.0680e-8

2.2269e-8

1.6898e-8

4.4966e-6

2.3874e-7

3.2709e-8

8.2420e-9

43.3

203

GBOS

HHZ

4.2084e-6

5.4715e-7

2.6931e-7

7.8259e-8

5.0283e-8

1.2177e-5

1.7435e-6

7.2335e-8

1.5556e-8

58.6

123

GBOS

HHN

3.6366e-6

4.8842e-7

1.9844e-7

6.0717e-8

4.2287e-8

1.0645e-5

1.1116e-6

5.5461e-8

1.0005e-8

58.6

123

GBOS

HHE

3.6630e-6

4.1413e-7

2.1202e-7

6.7496e-8

5.3694e-8

8.2005e-6

9.6431e-7

6.1715e-8

1.1654e-8

58.6

123

RRL

HHZ

6.2626e-7

1.0246e-7

4.7313e-8

2.0601e-8

1.2825e-8

1.5175e-6

2.2832e-7

2.4292e-8

2.2050e-9

60.3

322

RRL

HHN

7.8432e-7

1.6928e-7

9.0952e-8

2.5315e-8

1.7077e-8

2.6456e-6

4.0036e-7

2.5992e-8

3.9201e-9

60.3

322

RRL

HHE

6.6176e-7

1.0076e-7

6.8177e-8

3.2555e-8

1.9563e-8

2.2305e-6

2.6095e-7

2.5171e-8

2.9420e-9

60.3

322

*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): 0.6 2026-10-21 15:58:57 (UTC)

MANUAL Location - Area: Alpi Cozie , magnitude (M_L): 0.6
2026-10-21 15:58:57 (UTC)