Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 01-10-2023 and time 08:30:28 (UTC) in region 3 km SE San Lorenzo Nuovo (VT)

A magnitude ML 2.0 earthquake occured in region: 3 km SE San Lorenzo Nuovo (VT), on

  • 01-10-2023 08:30:28 (UTC)
  • 01-10-2023 10:30:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6740, 11.9340 at 6 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 5 2683 4774
Castel Giorgio TR 5 2131 6905
Bolsena VT 5 3991 10896
Gradoli VT 7 1353 12249
Acquapendente VT 10 5506 17755
Latera VT 10 836 18591
Onano VT 10 995 19586
Castel Viscardo TR 11 2938 22524
Proceno VT 13 557 23081
Porano TR 14 1966 25047
Capodimonte VT 14 1731 26778
Bagnoregio VT 15 3650 30428
Lubriano VT 15 909 31337
Valentano VT 15 2868 34205
Orvieto TR 15 20630 54835
Marta VT 15 3499 58334
Allerona TR 16 1794 60128
Montefiascone VT 17 13432 73560
Sorano GR 18 3428 76988
Piansano VT 19 2079 79067

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of Viterbo (67173 inhabitants)
60 Km W of Terni (111501 inhabitants)
61 Km SW of Perugia (166134 inhabitants)
66 Km N of Civitavecchia (52991 inhabitants)
68 Km E of Grosseto (82087 inhabitants)
70 Km W of Foligno (57155 inhabitants)
87 Km SE of Siena (53903 inhabitants)
88 Km S of Arezzo (99543 inhabitants)
98 Km NW of Roma (2864731 inhabitants)
99 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 2.0 2023-10-01
08:30:28		 42.6737 11.9343 6 2023-10-01
08:58:40		 Sala Sismica INGV-Roma 121639571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-01 08:30:28 ± 0.22
Latitude 42.6737 ± 0.0090
Longitude 11.9343 ± 0.0098
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121639571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 855
Semi-minor axis of confidence ellipse (meter) 808
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 325
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.70327
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 9
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.4
Num. used stations 18
Type of magnitude ML
Reference to an origin 121639571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-01 08:58:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CH.MUGIO.HHZ. 2023-10-01T08:32:15.27 3.0 undecidable manual Sn 0.95 0
GU.CANO.HHZ. 2023-10-01T08:32:06.82 3.0 undecidable manual Sg 9.03 0
IV.ACATE.EHZ. 2023-10-01T08:31:59.12 3.0 negative manual Pn -4.36 0
IV.SELL.HHZ. 2023-10-01T08:31:58.74 3.0 positive manual Pg 7.66 0
IV.ALJA.HHZ. 2023-10-01T08:31:56.56 3.0 undecidable manual Pg 4.9 0
IV.MAGA.HHZ. 2023-10-01T08:31:56.35 3.0 undecidable manual Sn -2.31 0
OX.MARN.HHZ. 2023-10-01T08:31:49.85 3.0 undecidable manual Sn -2.99 0
GU.BURY.HHZ. 2023-10-01T08:31:28.73 3.0 negative manual Pn 4.29 0
IV.CDRU.HNZ. 2023-10-01T08:31:24.94 3.0 undecidable manual Pn -1.45 0
IV.AGLI.HHZ. 2023-10-01T08:31:14.28 3.0 undecidable manual Pn -1.72 0
GU.GRAM.HHZ. 2023-10-01T08:31:10.02 3.0 positive manual Pg 2.33 0
IV.LPEL.HHZ. 2023-10-01T08:31:05.94 3.0 undecidable manual Pg 1.75 0
IV.ATMI.HHZ. 2023-10-01T08:30:53.60 0.6 undecidable manual S 20 78.0663 50 0.5 41
IV.CAFI.HHZ. 2023-10-01T08:30:51.29 0.3 undecidable manual S 2 72.7716 50 -0.38 64
IV.MOMA.HHE. 2023-10-01T08:30:47.19 1.0 undecidable manual S 74 53.8017 50 0.59 21
IV.BARO.EHZ. 2023-10-01T08:30:45.29 1.0 undecidable manual S 169 48.2184 50 0.18 23
IV.ATMI.HHZ. 2023-10-01T08:30:43.52 0.6 undecidable manual P 20 78.0663 50 0.78 37
IV.ARCI.HNZ. 2023-10-01T08:30:42.99 0.6 undecidable manual S 298 42.3243 98 -0.4 45
IV.CAFI.HHZ. 2023-10-01T08:30:41.18 0.3 undecidable manual P 2 72.7716 50 -0.73 57
IV.MOMA.HHE. 2023-10-01T08:30:39.40 1.0 undecidable manual P 74 53.8017 50 0.41 22
TV.SF11.HHE. 2023-10-01T08:30:39.32 0.6 undecidable manual S 316 30.0477 101 0.14 48
IV.MGAB.HHZ. 2023-10-01T08:30:39.31 0.3 undecidable manual S 29 30.2475 101 0.06 74
IV.BARO.EHZ. 2023-10-01T08:30:37.81 1.0 undecidable manual P 169 48.2184 50 -0.32 23
IV.ARCI.HNZ. 2023-10-01T08:30:37.43 1.0 undecidable manual P 298 42.3243 98 0.29 23
IV.MCIV.CHE. 2023-10-01T08:30:37.48 0.6 undecidable manual S 299 24.0537 103 0.33 47
IV.SACS.HHZ. 2023-10-01T08:30:35.88 0.3 undecidable manual S 354 19.5693 106 0.22 73
TV.SF11.HHE. 2023-10-01T08:30:35.55 1.0 undecidable manual P 316 30.0477 101 0.84 19
IV.MGAB.HHZ. 2023-10-01T08:30:34.28 0.1 undecidable manual P 29 30.2475 101 -0.47 90
IV.MCIV.CHE. 2023-10-01T08:30:33.47 1.0 undecidable manual P 299 24.0537 103 -0.06 25
IV.SACS.HHZ. 2023-10-01T08:30:32.61 0.1 undecidable manual P 354 19.5693 106 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MGAB.HNN. ML:1.8 0.00035299999999999996 1.72 AML other m 2023-10-01T08:30:39.89
IV.MGAB.HHN. ML:1.9 0.0003605 1.04 AML other m 2023-10-01T08:30:39.89
IV.MGAB.HNE. ML:1.8 0.0002935 0.54 AML other m 2023-10-01T08:30:40.55
IV.MGAB.HHE. ML:1.8 0.0002895 0.42 AML other m 2023-10-01T08:30:40.54
IV.CAFI.HHE. ML:1.2 0.0000268 0.94 AML other m 2023-10-01T08:30:51.42
IV.CAFI.HHN. ML:1.2 0.00002585 0.48 AML other m 2023-10-01T08:30:51.67
IV.MURB.HHE. ML:2.1 0.0001885 1.14 AML other m 2023-10-01T08:30:55.31
IV.ATMI.HHE. ML:1.8 0.0001009 1.12 AML other m 2023-10-01T08:30:57.79
IV.MURB.HHN. ML:2.2 0.000215 0.78 AML other m 2023-10-01T08:30:59.20
IV.ATMI.HHN. ML:1.8 0.0000989 0.42 AML other m 2023-10-01T08:30:59.61
IV.LPEL.HHN. ML:2.1 0.000042 1.14 AML other m 2023-10-01T08:31:06.39
IV.AGLI.HHE. ML:2.3 0.000026000000000000002 0.06 AML other m 2023-10-01T08:31:26.30
IV.AGLI.HHN. ML:2.3 0.000029350000000000002 1.42 AML other m 2023-10-01T08:31:28.16
IV.LPEL.HHE. ML:2.3 0.00006409999999999999 0.92 AML other m 2023-10-01T08:31:35.69
IV.MAGA.HHN. ML:3.1 0.00010105 0.06 AML other m 2023-10-01T08:32:35.46
IV.MAGA.HHE. ML:3.2 0.000134 0.06 AML other m 2023-10-01T08:32:36.04
IV.SACS.HHE. ML:1.7 0.00041640445000000004 0.2176 AML other m 2023-10-01T08:30:36.60
IV.SACS.HHN. ML:1.6 0.00031917985 0.16 AML other m 2023-10-01T08:30:35.00
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
Waveforms Seismic signals in miniseed + resp format Download