RSNI - Manually revised location

MANUAL Location - Area: Appennino forlivese , magnitude (M_L): 1.4
2025-08-15 09:22:40 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2025-08-15 09:53:48

Earthquake info - Manual location

Event - ID :	250815092141
Magnitude (M_L) :	1.4 +/- 0.1
Origin Time :	2025-08-15 09:22:40.372 (UTC)
Location :	Latitude: 44.122 N, Longitude: 11.633 E
Area :	Appennino forlivese
Depth (km) :	19.84
Distances (km) :	5.2 --- Marradi 6.8 --- Palazzuolo sul Senio 9.9 --- Tredozio 11.5 --- Casola Valsenio 13.5 --- Modigliana 14.4 --- Castel del Rio 16.0 --- Portico e San Benedetto 16.1 --- Brisighella 16.5 --- Fontanelice 17.9 --- Borgo Tossignano 18.1 --- Rocca San Casciano 18.7 --- Riolo Terme 19.7 --- Premilcuore 19.8 --- Casalfiumanese 20.2 --- Firenzuola 20.4 --- Dovadola 21.6 --- San Godenzo 24.7 --- Vicchio 25.8 --- Castel Bolognese 25.8 --- Castrocaro Terme e Terra del Sole

Quality location estimate: Erh: 1.3 km, Erz: 4.8 km, Nf: 12, Gap: 179 °, Rms: 0.23

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.
MTRZ	IV	2025-08-15 09:22:46.810	0.014	0	-0.08	1.44	2025-08-15 09:22:52.189	0.040	0	0.08	1.52	33.8
IMOL	IV	2025-08-15 09:22:47.320	0.014	0	0.01	1.74	2025-08-15 09:22:52.969	0.084	2	0.02	1.51	34.2
RUFI	IV	2025-08-15 09:22:47.930	0.017	0	0.12	1.33	2025-08-15 09:22:53.310	0.102	3	-0.13	1.19	38.5
POPM	GU	2025-08-15 09:22:54.215	0.020	0	0.63	0.17	2025-08-15 09:23:03.646	0.432	9	0.24	0.76	73.3
OSSC	IV	2025-08-15 09:22:55.636	0.020	0	1.25	0.23	2025-08-15 09:23:04.509	0.040	0	-0.06	1.15	76.2
MAIM	GU	2025-08-15 09:22:58.430	0.047	2	1.16	0.26	2025-08-15 09:23:09.960	0.485	9	0.24	0.70	96.2

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
POPM	GU	HH	1.33	8.88e-2	73.3	263
OSSC	IV	HH	1.48	5.72e-2	76.2	205
MAIM	GU	HH	1.27	1.82e-2	96.2	256

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.
(°)

MTRZ

HHZ

1.0872e-5

1.6796e-6

1.9503e-6

1.3547e-6

7.8683e-7

1.8854e-5

1.4654e-5

1.1356e-6

5.8974e-8

33.8

322

MTRZ

HHN

1.9905e-5

6.3545e-6

7.0332e-6

4.4766e-6

1.4509e-6

5.3867e-5

3.2621e-5

2.0341e-6

2.3694e-7

33.8

322

MTRZ

HHE

6.4385e-6

1.5207e-6

1.4716e-6

1.0227e-6

3.2207e-7

1.2226e-5

9.1195e-6

3.7471e-7

5.2187e-8

33.8

322

POPM

HHZ

1.7600e-6

5.0068e-7

4.1410e-7

4.1046e-7

1.5514e-7

5.9347e-6

2.9330e-6

1.7018e-7

1.5428e-8

73.3

263

POPM

HHN

4.7560e-6

1.2276e-6

8.0962e-7

3.5306e-7

1.3869e-7

2.2663e-5

4.7693e-6

1.5888e-7

2.8745e-8

73.3

263

POPM

HHE

2.4016e-6

5.2902e-7

4.6213e-7

2.2845e-7

9.0926e-8

9.2578e-6

1.8811e-6

1.0462e-7

1.3321e-8

73.3

263

OSSC

HHZ

1.1244e-6

2.0303e-7

2.0599e-7

1.7325e-7

7.1714e-8

2.8232e-6

1.1587e-6

8.0290e-8

6.2880e-9

76.2

205

OSSC

HHN

1.3004e-6

3.8006e-7

3.8288e-7

2.3375e-7

1.2040e-7

3.7449e-6

2.1294e-6

1.2851e-7

1.0233e-8

76.2

205

OSSC

HHE

2.3173e-6

6.6836e-7

5.4966e-7

2.6558e-7

1.0808e-7

4.1681e-6

2.4119e-6

1.1613e-7

1.7468e-8

76.2

205

MAIM

HHZ

3.6150e-7

1.1904e-7

1.0077e-7

7.0420e-8

2.4851e-8

1.0911e-6

6.1583e-7

2.8080e-8

3.1760e-9

96.2

256

MAIM

HHN

3.1874e-7

1.3139e-7

1.3083e-7

1.0200e-7

4.3705e-8

8.7519e-7

6.1098e-7

5.9871e-8

4.6100e-9

96.2

256

MAIM

HHE

3.4475e-7

1.2319e-7

1.2452e-7

1.0370e-7

5.2960e-8

9.4834e-7

7.7707e-7

6.0311e-8

5.0225e-9

96.2

256

*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: Appennino forlivese , magnitude (ML): 1.4 2025-08-15 09:22:40 (UTC)

MANUAL Location - Area: Appennino forlivese , magnitude (M_L): 1.4
2025-08-15 09:22:40 (UTC)