RSNI - Manually revised location

MANUAL Location - Area: Appennino modenese , magnitude (M_L): 1.4
2026-05-04 09:38:23 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2026-05-04 10:38:26

Earthquake info - Manual location

Event - ID :	260504093700
Magnitude (M_L) :	1.4 +/- 0.2
Origin Time :	2026-05-04 09:38:23.671 (UTC)
Location :	Latitude: 44.338 N, Longitude: 10.906 E
Area :	Appennino modenese
Depth (km) :	25.32
Distances (km) :	5.7 --- Pavullo nel Frignano 7.1 --- Zocca 8.0 --- Montese 10.0 --- Castel d Aiano 10.9 --- Guiglia 13.5 --- Serramazzoni 14.2 --- Marano sul Panaro 14.2 --- Lama Mocogno 14.5 --- Polinago 14.6 --- Savigno 15.8 --- Gaggio Montano 16.0 --- Sestola 16.9 --- Fanano 17.2 --- Castello di Serravalle 17.5 --- Vergato 17.9 --- Montecreto 18.0 --- Vignola 18.8 --- Castelvetro di Modena 18.8 --- Savignano sul Panaro 19.6 --- Lizzano in Belvedere

Quality location estimate: Erh: 3 km, Erz: 4.4 km, Nf: 20, Gap: 163 °, Rms: 0.24

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.
ZCCA	IV	2026-05-04 09:38:29.024	0.020	0	-0.21	1.48	2026-05-04 09:38:33.684	0.042	1	0.02	1.60	26.7
GSCL	GU	2026-05-04 09:38:29.910	0.070	3	-0.83	0.18	2026-05-04 09:38:34.579	0.241	6	-1.40	0.13	36.3
POPM	GU	2026-05-04 09:38:31.610	0.025	1	0.03	1.56	2026-05-04 09:38:37.610	0.137	4	0.10	1.26	43.2
BDI	IV	2026-05-04 09:38:32.032	0.020	0	-0.19	1.55	2026-05-04 09:38:38.316	0.040	0	-0.29	1.11	46.8
SARM	GU	2026-05-04 09:38:32.830	0.028	1	-0.12	1.69	2026-05-04 09:38:38.875	0.345	7	-0.96	0.32	51.0
VLC	MN	2026-05-04 09:38:33.204	0.020	0	0.02	1.60	2026-05-04 09:38:40.333	0.040	0	0.11	1.25	52.7
CARD	GU	2026-05-04 09:38:33.113	0.020	0	-0.31	0.99	2026-05-04 09:38:40.428	0.040	0	-0.20	1.40	54.8
MAIM	GU	2026-05-04 09:38:35.890	0.036	1	1.04	0.09	2026-05-04 09:38:43.197	0.040	0	0.18	1.03	63.1
RUFI	IV	2026-05-04 09:38:38.010	0.045	2	-0.02	1.61	2026-05-04 09:38:47.952	0.040	0	-1.11	0.22	77.8
MSSA	IV	2026-05-04 09:38:43.575	0.020	0	0.25	0.81	2026-05-04 09:38:58.878	0.040	0	1.15	0.11	113.5

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
GSCL	GU	HH	1.38	2.06e-1	36.3	273
POPM	GU	HH	1.80	7.95e-1	43.2	200
SARM	GU	EH	1.24	9.19e-2	51.0	247
VLC	MN	HH	1.16	4.19e-2	52.7	244
CARD	GU	HH	1.47	1.12e-1	54.8	224
MAIM	GU	HH	1.29	4.87e-2	63.1	215
MSSA	IV	HH	1.45	2.06e-2	113.5	269

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.
(°)

ZCCA

HHZ

2.1788e-5

5.0520e-6

4.2275e-6

1.5627e-6

7.6717e-7

4.3729e-5

2.8125e-5

1.1649e-6

1.6083e-7

26.7

ZCCA

HHN

2.0513e-5

7.2513e-6

5.7846e-6

6.0143e-6

2.3669e-6

3.6990e-5

2.4940e-5

2.7874e-6

2.4453e-7

26.7

ZCCA

HHE

2.6116e-5

1.2936e-5

1.0943e-5

7.7536e-6

3.1387e-6

3.3598e-5

6.8596e-5

4.2864e-6

4.4266e-7

26.7

GSCL

HHZ

2.6105e-6

6.0518e-7

6.7276e-7

5.1231e-7

2.2538e-7

7.5042e-6

3.0347e-6

2.7529e-7

2.2139e-8

36.3

273

GSCL

HHN

5.4134e-6

1.3925e-6

1.5517e-6

7.2440e-7

3.3109e-7

1.2326e-5

7.2314e-6

4.5433e-7

3.5495e-8

36.3

273

GSCL

HHE

5.9521e-6

2.0919e-6

1.5557e-6

8.2279e-7

4.4835e-7

7.6712e-6

9.6979e-6

5.5415e-7

6.1634e-8

36.3

273

POPM

HHZ

1.3273e-5

2.8890e-6

2.3776e-6

5.9508e-7

2.9391e-7

2.4207e-5

1.4844e-5

4.5369e-7

7.3652e-8

43.2

200

POPM

HHN

3.0353e-5

8.9020e-6

6.4274e-6

2.0057e-6

1.1066e-6

4.8926e-5

3.9884e-5

1.6156e-6

2.4698e-7

43.2

200

POPM

HHE

2.2438e-5

6.0721e-6

5.5715e-6

1.5072e-6

7.2316e-7

4.4893e-5

4.1156e-5

1.0240e-6

1.5361e-7

43.2

200

SARM

EHZ

1.7867e-6

4.1589e-7

3.3718e-7

1.9883e-7

7.9521e-8

2.7603e-6

2.5866e-6

1.0034e-7

1.2234e-8

51.0

247

SARM

EHN

2.0359e-6

5.6095e-7

5.2828e-7

4.1561e-7

1.8489e-7

4.4123e-6

3.5452e-6

2.0208e-7

2.1152e-8

51.0

247

SARM

EHE

1.9054e-6

6.7112e-7

5.8030e-7

5.2107e-7

2.0365e-7

2.9660e-6

4.2272e-6

2.3248e-7

2.8001e-8

51.0

247

VLC

HHZ

1.3988e-6

2.8441e-7

3.3348e-7

2.4079e-7

8.1234e-8

2.3222e-6

1.3066e-6

9.4050e-8

1.1079e-8

52.7

244

VLC

HHN

1.1550e-6

2.5001e-7

2.8149e-7

1.8332e-7

7.7225e-8

3.1754e-6

1.6622e-6

9.3839e-8

7.5959e-9

52.7

244

VLC

HHE

1.5876e-6

4.1040e-7

2.9404e-7

2.3292e-7

1.0557e-7

2.4869e-6

2.2344e-6

1.1413e-7

1.1088e-8

52.7

244

CARD

HHZ

3.0587e-6

5.0235e-7

3.9231e-7

2.2658e-7

8.2379e-8

9.2988e-6

1.6483e-6

1.0529e-7

1.4904e-8

54.8

224

CARD

HHN

5.5545e-6

1.0995e-6

9.6562e-7

4.0466e-7

1.5083e-7

2.1835e-5

6.7543e-6

1.7434e-7

2.5866e-8

54.8

224

CARD

HHE

5.5843e-6

1.2403e-6

1.1697e-6

5.5480e-7

2.1728e-7

2.1658e-5

4.7076e-6

2.8092e-7

3.3800e-8

54.8

224

MAIM

HHZ

8.1553e-7

2.2466e-7

1.9255e-7

1.3513e-7

6.5324e-8

2.2409e-6

1.6354e-6

7.5673e-8

6.2106e-9

63.1

215

MAIM

HHN

1.7432e-6

4.4715e-7

4.2767e-7

2.7557e-7

1.3598e-7

3.0155e-6

1.9652e-6

1.4809e-7

1.4581e-8

63.1

215

MAIM

HHE

1.1838e-6

3.9736e-7

3.4135e-7

1.9687e-7

1.0299e-7

2.2402e-6

3.4314e-6

1.1808e-7

1.1317e-8

63.1

215

MSSA

HHZ

3.9975e-7

1.0842e-7

8.0596e-8

4.4364e-8

3.2622e-8

1.7298e-6

3.3017e-7

4.6888e-8

3.6936e-9

113.5

269

MSSA

HHN

3.4698e-7

1.1769e-7

8.8128e-8

9.5626e-8

6.6277e-8

6.5304e-7

4.6918e-7

1.0380e-7

4.3239e-9

113.5

269

MSSA

HHE

4.0710e-7

1.5146e-7

1.2052e-7

1.0304e-7

5.8245e-8

8.6574e-7

6.2368e-7

7.9385e-8

6.6193e-9

113.5

269

*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 modenese , magnitude (ML): 1.4 2026-05-04 09:38:23 (UTC)

MANUAL Location - Area: Appennino modenese , magnitude (M_L): 1.4
2026-05-04 09:38:23 (UTC)