Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 28-09-2023 and time 22:43:46 (Italy) in region 3 km S San Lorenzo Nuovo (VT)

A magnitude ML 1.4 earthquake occured in region: 3 km S San Lorenzo Nuovo (VT), on

  • 28-09-2023 20:43:46 (UTC)
  • 28-09-2023 22:43:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6620, 11.9080 at 5 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
San Lorenzo Nuovo VT 3 2091 2091
Grotte di Castro VT 3 2683 4774
Gradoli VT 5 1353 6127
Bolsena VT 7 3991 10118
Latera VT 8 836 10954
Castel Giorgio TR 8 2131 13085
Onano VT 8 995 14080
Acquapendente VT 10 5506 19586
Capodimonte VT 12 1731 21317
Proceno VT 12 557 21874
Valentano VT 13 2868 24742
Castel Viscardo TR 13 2938 27680
Marta VT 14 3499 31179
Sorano GR 16 3428 34607
Bagnoregio VT 16 3650 38257
Porano TR 16 1966 40223
Lubriano VT 17 909 41132
Montefiascone VT 17 13432 54564
Piansano VT 17 2079 56643
Allerona TR 18 1794 58437
Orvieto TR 18 20630 79067
Ischia di Castro VT 18 2326 81393
Farnese VT 19 1527 82920
Pitigliano GR 20 3818 86738

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of Viterbo (67173 inhabitants)
62 Km W of Terni (111501 inhabitants)
63 Km SW of Perugia (166134 inhabitants)
64 Km N of Civitavecchia (52991 inhabitants)
66 Km E of Grosseto (82087 inhabitants)
73 Km W of Foligno (57155 inhabitants)
87 Km SE of Siena (53903 inhabitants)
90 Km S of Arezzo (99543 inhabitants)
98 Km NW of Roma (2864731 inhabitants)
100 Km NW of Guidonia Montecelio (88673 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.4 2023-09-28
20:43:46		 42.6617 11.9082 5 2023-09-28
20:49:06		 Sala Sismica INGV-Roma 121559981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-28 20:43:46 ± 0.23
Latitude 42.6617 ± 0.0090
Longitude 11.9082 ± 0.0135
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121559981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 968
Semi-minor axis of confidence ellipse (meter) 953
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 50
Circular confidence region, given by single value of horizontal uncertainty (meter) 970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 139
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.72216
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 121559981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-28 20:49:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATMI.HHZ. 2023-09-28T20:44:11.66 0.6 undecidable manual S 21 80.1642 50 0.38 50
IV.CAFI.HHZ. 2023-09-28T20:44:09.42 0.6 undecidable manual S 4 74.1702 50 -0.27 51
IV.MOMA.HHZ. 2023-09-28T20:44:05.02 0.6 undecidable manual S 73 56.1993 50 0.13 55
IV.FRON.EHZ. 2023-09-28T20:44:04.82 3.0 undecidable manual Pg -0.58 0
IV.BARO.EHZ. 2023-09-28T20:44:02.74 0.6 undecidable manual S 166 47.3193 50 0.21 55
IV.ATMI.HHZ. 2023-09-28T20:44:01.45 0.6 undecidable manual P 21 80.1642 50 0.8 43
IV.MGAB.HHZ. 2023-09-28T20:43:58.13 0.3 undecidable manual S 31 32.4453 99 0.58 77
IV.CAFI.HHZ. 2023-09-28T20:43:58.98 0.6 undecidable manual P 4 74.1702 50 -0.77 44
IV.MOMA.HHZ. 2023-09-28T20:43:56.75 0.3 negative manual P 73 56.1993 50 -0.22 80
IV.BARO.EHZ. 2023-09-28T20:43:55.48 0.3 undecidable manual P 166 47.3193 50 -0.14 83
TV.SF11.HHZ. 2023-09-28T20:43:55.84 0.3 undecidable manual S 321 29.5482 100 -0.75 72
IV.MCIV.CHZ. 2023-09-28T20:43:54.75 0.3 undecidable manual S 305 22.8549 103 0.43 82
IV.SACS.HHZ. 2023-09-28T20:43:53.65 0.3 undecidable manual S 0 20.7681 104 0.05 89
TV.SF11.HHZ. 2023-09-28T20:43:52.46 0.6 undecidable manual P 321 29.5482 100 0.28 56
IV.MGAB.HHZ. 2023-09-28T20:43:52.10 0.1 positive manual P 31 32.4453 99 -0.64 100
IV.MCIV.CHZ. 2023-09-28T20:43:51.31 0.6 negative manual P 305 22.8549 103 0.44 54
IV.SACS.HHZ. 2023-09-28T20:43:50.39 0.6 undecidable manual P 0 20.7681 104 -0.06 59
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HHE. ML:1.6 0.0003435 1.4 AML other m 2023-09-28T20:43:53.84
IV.SACS.HHN. ML:1.4 0.00017549999999999998 0.12 AML other m 2023-09-28T20:43:54.41
IV.MCIV.CHN. ML:1.2 0.00010077269 0.1152 AML other m 2023-09-28T20:43:56.20
IV.MCIV.CHE. ML:1.2 0.0001222888 0.3712 AML other m 2023-09-28T20:43:54.97
IV.MGAB.HHE. ML:1.6 0.000182 0.2 AML other m 2023-09-28T20:43:59.74
IV.MGAB.HHN. ML:1.5 0.0001443195 0.1536 AML other m 2023-09-28T20:44:00.19
IV.ATMI.HHE. ML:1.6 0.00005399395 0.3328 AML other m 2023-09-28T20:44:12.19
IV.ATMI.HHN. ML:1.6 0.000059300000000000005 0.42 AML other m 2023-09-28T20:44:18.09
IV.SACS.HNE. ML:1.7 0.00036672985 0.1664 AML other m 2023-09-28T20:43:53.84
IV.SACS.HNN. ML:1.3 0.00015282185 0.128 AML other m 2023-09-28T20:43:53.95
IV.MGAB.HNE. ML:1.6 0.00016603035 0.2176 AML other m 2023-09-28T20:43:59.74
IV.MGAB.HNN. ML:1.5 0.00015916358 0.1664 AML other m 2023-09-28T20:44:00.19
IV.BARO.HNE. ML:1.6 0.00011771815 0.8192 AML other m 2023-09-28T20:44:05.01
IV.BARO.HNN. ML:1.7 0.0001567967 1.0496 AML other m 2023-09-28T20:44:17.52
IV.BARO.EHE. ML:0.5 0.000011924062499999999 0.7424 AML other m 2023-09-28T20:44:14.13
IV.BARO.EHN. ML:0.9 0.000023028890000000002 0.4352 AML other m 2023-09-28T20:44:06.36
IV.MOMA.HHE. ML:1.2 0.000033822065 0.2304 AML other m 2023-09-28T20:44:05.80
IV.MOMA.HHN. ML:1.6 0.00008806598 0.3968 AML other m 2023-09-28T20:44:07.44
IV.MOMA.HNE. ML:1.9 0.00017667355000000002 0.6528 AML other m 2023-09-28T20:44:15.57
IV.MOMA.HNN. ML:1.7 0.00012549895 0.9856 AML other m 2023-09-28T20:44:22.30
IV.CAFI.HNE. ML:1.4 0.000040302405 1.0112 AML other m 2023-09-28T20:44:26.41
IV.CAFI.HNN. ML:1.4 0.000036561180000000004 0.8064 AML other m 2023-09-28T20:44:06.99
IV.CAFI.HHE. ML:1.1 0.000022111051 0.1408 AML other m 2023-09-28T20:44:09.60
IV.CAFI.HHN. ML:1.1 0.00001919048 0.4864 AML other m 2023-09-28T20:44:10.90
IV.FRON.EHE. ML:1.1 0.000012028839999999998 0.9344 AML other m 2023-09-28T20:44:28.24
IV.FRON.EHN. ML:1.1 0.000010007602 0.064 AML other m 2023-09-28T20:44:08.56
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download