RSNI - Manually revised location

MANUAL Location - Area: Mar Ligure , magnitude (M_L): 0.8
2023-03-11 21:50:57 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2023-03-13 08:25:45

Earthquake info - Manual location

Event - ID :	230311214941
Magnitude (M_L) :	0.8 +/- 0.2
Origin Time :	2023-03-11 21:50:57.563 (UTC)
Location :	Latitude: 43.705 N, Longitude: 9.898 E
Area :	Mar Ligure
Depth (km) :	6.00
Distances (km) :	33.7 --- Viareggio 36.3 --- Forte dei Marmi 38.1 --- Livorno 38.9 --- Pietrasanta 39.4 --- Portovenere 40.0 --- Massa 40.0 --- Massarosa 40.3 --- Vecchiano 40.5 --- Pisa 40.6 --- Ameglia 40.8 --- Carrara 41.3 --- Lerici 41.4 --- Montignoso 41.8 --- Seravezza 41.9 --- Camaiore 44.2 --- San Giuliano Terme 44.4 --- Ortonovo 45.0 --- Castelnuovo Magra 45.0 --- La Spezia 45.5 --- Sarzana

Quality location estimate: Erh: 2 km, Erz: 3.4 km, Nf: 18, Gap: 248 °, Rms: 0.20

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.
PII	IV	2023-03-11 21:51:05.928	0.020	0	-1.08	0.07	2023-03-11 21:51:12.363	0.040	0	-1.63	0.05	50.8
MAIM	GU	2023-03-11 21:51:07.298	0.020	0	-0.13	1.38	2023-03-11 21:51:13.485	0.500	9	-1.19	0.20	53.3
EQUI	GU	2023-03-11 21:51:07.275	0.020	0	-0.05	1.61	2023-03-11 21:51:14.147	0.130	3	-0.32	0.74	55.5
CARD	GU	2023-03-11 21:51:07.733	0.080	3	-0.15	1.30	2023-03-11 21:51:15.445	0.160	4	0.00	1.32	59.2
SARM	GU	2023-03-11 21:51:09.302	0.020	0	0.08	1.57	2023-03-11 21:51:18.246	0.130	3	0.42	0.63	67.1
BDI	IV	2023-03-11 21:51:09.858	0.020	0	0.14	1.42	2023-03-11 21:51:18.694	0.130	3	0.01	1.30	69.0
MSSA	IV	2023-03-11 21:51:11.049	0.040	1	0.06	1.57	2023-03-11 21:51:20.815	0.130	3	-0.10	1.18	74.7
POPM	GU	2023-03-11 21:51:11.426	0.020	0	0.07	1.56	2023-03-11 21:51:21.845	0.040	0	0.25	1.03	78.8
GRAM	GU	2023-03-11 21:51:12.943	0.180	7	0.24	1.05	2023-03-11 21:51:24.980	0.360	7	1.53	0.02	88.7

Local magnitude (M_L) calculation results

Station	Net	Channels	Stat. Mag.	Wood-And. Ampl.	Dist. (km)	Azimuth
MAIM	GU	HH	0.52	1.17e-2	53.3	64
EQUI	GU	HH	0.88	2.82e-2	55.5	22
CARD	GU	HH	1.02	3.40e-2	59.2	53
SARM	GU	EH	0.66	1.35e-2	67.1	37
BDI	IV	HH	0.86	2.10e-2	69.0	54
POPM	GU	HH	0.64	1.55e-2	78.8	61
GRAM	GU	HH	1.24	4.18e-2	88.7	9

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.
(°)

PII

HHZ

4.0378e-7

6.5542e-8

5.7289e-8

1.7954e-8

1.1473e-8

1.0948e-6

2.6861e-7

1.6685e-8

1.8679e-9

50.8

PII

HHN

6.0367e-7

9.4844e-8

7.8581e-8

3.6016e-8

1.5781e-8

1.7909e-6

4.7731e-7

1.7942e-8

2.8024e-9

50.8

PII

HHE

6.3462e-7

9.2877e-8

6.9565e-8

2.7307e-8

1.4947e-8

2.3984e-6

4.3327e-7

2.6350e-8

2.6584e-9

50.8

MAIM

HHZ

5.1309e-7

8.0425e-8

5.7249e-8

3.0286e-8

1.8748e-8

1.4854e-6

3.1908e-7

3.0803e-8

2.3468e-9

53.3

MAIM

HHN

5.5811e-7

1.1564e-7

1.0094e-7

5.6958e-8

2.1063e-8

1.3780e-6

4.2896e-7

2.9830e-8

4.2371e-9

53.3

MAIM

HHE

6.5528e-7

1.2787e-7

9.4990e-8

5.3471e-8

3.3931e-8

1.3121e-6

4.0862e-7

4.3641e-8

3.3552e-9

53.3

EQUI

HHZ

6.0039e-7

1.6839e-7

1.2370e-7

4.7678e-8

2.3528e-8

1.4273e-6

6.2321e-7

3.1779e-8

4.6503e-9

55.5

EQUI

HHN

6.5992e-7

1.5255e-7

1.2327e-7

4.7466e-8

2.7635e-8

1.9996e-6

6.4111e-7

3.8933e-8

4.7856e-9

55.5

EQUI

HHE

1.1001e-6

3.1706e-7

2.2486e-7

8.5048e-8

4.7861e-8

3.5540e-6

1.5483e-6

8.0729e-8

1.0583e-8

55.5

CARD

HHZ

3.5170e-6

2.8277e-7

1.0197e-7

3.9661e-8

1.9461e-8

2.6757e-6

6.6488e-7

3.1174e-8

5.8956e-9

59.2

CARD

HHN

6.3660e-6

7.7278e-7

2.4536e-7

5.8207e-8

3.1712e-8

1.6131e-5

8.4562e-7

6.2320e-8

1.5217e-8

59.2

CARD

HHE

7.2663e-6

8.7030e-7

2.4560e-7

7.4145e-8

4.8245e-8

1.6985e-5

7.7257e-7

6.7750e-8

1.7597e-8

59.2

SARM

EHZ

7.0756e-7

1.1349e-7

7.4270e-8

3.8750e-8

1.6845e-8

1.2998e-6

4.5139e-7

2.7636e-8

3.0341e-9

67.1

SARM

EHN

5.6490e-7

1.1853e-7

1.0971e-7

5.8268e-8

2.5777e-8

1.3945e-6

7.2112e-7

3.7585e-8

4.1202e-9

67.1

SARM

EHE

4.4932e-7

1.1108e-7

8.8849e-8

5.8861e-8

2.1242e-8

1.2634e-6

4.8226e-7

2.3582e-8

3.9388e-9

67.1

BDI

HHZ

5.7667e-7

8.2386e-8

6.7456e-8

2.8797e-8

1.5764e-8

1.3720e-6

4.0049e-7

1.8815e-8

2.4460e-9

69.0

BDI

HHN

7.4029e-7

1.2809e-7

1.1045e-7

4.9217e-8

2.2585e-8

2.4426e-6

6.2167e-7

2.6137e-8

3.2511e-9

69.0

BDI

HHE

6.0158e-7

1.7427e-7

1.6521e-7

7.5901e-8

3.7115e-8

2.2692e-6

1.5128e-6

4.9670e-8

5.8202e-9

69.0

MSSA

HHZ

2.0808e-6

2.4919e-7

7.9692e-8

3.6090e-8

3.6379e-8

2.6706e-6

4.5780e-7

5.8789e-8

6.0956e-9

74.7

336

MSSA

HHN

3.6370e-6

5.6344e-7

2.7293e-7

6.4617e-8

4.8879e-8

2.0527e-5

9.3325e-7

8.7816e-8

1.4143e-8

74.7

336

MSSA

HHE

3.8293e-6

6.4080e-7

3.3185e-7

8.2871e-8

5.5177e-8

2.2424e-5

1.0482e-6

1.0013e-7

1.6022e-8

74.7

336

POPM

HHZ

9.9286e-7

1.2716e-7

8.0528e-8

3.1271e-8

1.9254e-8

2.7142e-6

3.2818e-7

2.5854e-8

2.9416e-9

78.8

POPM

HHN

7.8118e-7

1.5191e-7

1.2742e-7

3.9241e-8

2.2041e-8

3.0582e-6

8.1272e-7

3.2736e-8

4.0906e-9

78.8

POPM

HHE

7.3582e-7

1.7455e-7

1.4312e-7

3.7170e-8

2.2578e-8

1.3880e-6

9.4632e-7

4.2151e-8

4.8067e-9

78.8

GRAM

HHZ

5.8385e-7

1.4876e-7

1.2286e-7

5.7310e-8

3.3270e-8

1.1589e-6

5.4006e-7

5.0450e-8

4.9482e-9

88.7

GRAM

HHN

1.1514e-6

3.8151e-7

2.8298e-7

1.4145e-7

4.5365e-8

2.3650e-6

1.4153e-6

6.2115e-8

8.7297e-9

88.7

GRAM

HHE

1.2559e-6

3.5378e-7

3.5581e-7

2.3171e-7

1.3632e-7

2.5397e-6

2.6213e-6

2.0228e-7

2.3768e-8

88.7

*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: Mar Ligure , magnitude (ML): 0.8 2023-03-11 21:50:57 (UTC)

MANUAL Location - Area: Mar Ligure , magnitude (M_L): 0.8
2023-03-11 21:50:57 (UTC)