Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 29-09-2023 and time 03:06:14 (Italy) in region 3 km SE San Lorenzo Nuovo (VT)

A magnitude ML 1.7 earthquake occured in region: 3 km SE San Lorenzo Nuovo (VT), on

  • 29-09-2023 01:06:14 (UTC)
  • 29-09-2023 03:06:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6710, 11.9370 at 7 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
Bolsena VT 5 3991 6082
Grotte di Castro VT 5 2683 8765
Castel Giorgio TR 6 2131 10896
Gradoli VT 7 1353 12249
Latera VT 10 836 13085
Acquapendente VT 10 5506 18591
Onano VT 10 995 19586
Castel Viscardo TR 11 2938 22524
Proceno VT 13 557 23081
Capodimonte VT 14 1731 24812
Porano TR 14 1966 26778
Bagnoregio VT 14 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
Celleno VT 20 1355 80422

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of Viterbo (67173 inhabitants)
59 Km W of Terni (111501 inhabitants)
61 Km SW of Perugia (166134 inhabitants)
65 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)
89 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 1.7 2023-09-29
01:06:14		 42.6713 11.9372 7 2023-09-29
01:11:25		 Sala Sismica INGV-Roma 121564601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-29 01:06:14 ± 0.15
Latitude 42.6713 ± 0.0063
Longitude 11.9372 ± 0.0086
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121564601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 659
Semi-minor axis of confidence ellipse (meter) 603
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
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 18
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.70507
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 121564601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-29 01:11:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATMI.HHZ. 2023-09-29T01:06:39.73 0.6 undecidable manual S 20 78.2661 50 0.83 37
IV.CAFI.HHZ. 2023-09-29T01:06:37.35 0.6 undecidable manual S 2 72.9714 50 -0.15 46
IV.FDMO.HHZ. 2023-09-29T01:06:32.43 3.0 undecidable manual P -0.32 0
IV.MOMA.HHZ. 2023-09-29T01:06:32.12 0.6 undecidable manual S 74 53.6019 50 -0.21 47
IV.NRCA.HHZ. 2023-09-29T01:06:31.94 3.0 negative manual P -0.12 0
IV.BARO.EHZ. 2023-09-29T01:06:30.98 0.6 undecidable manual S 169 47.9187 50 0.18 48
IV.ARCI.HHZ. 2023-09-29T01:06:28.94 0.6 undecidable manual S 298 42.624 50 -0.44 46
IV.ATMI.HHZ. 2023-09-29T01:06:28.79 0.6 undecidable manual P 20 78.2661 50 0.15 46
IV.CAFI.HHZ. 2023-09-29T01:06:27.27 0.6 positive manual P 2 72.9714 50 -0.56 42
IV.MGAB.HHZ. 2023-09-29T01:06:25.55 0.6 undecidable manual S 28 30.3474 103 0.13 50
IV.MOMA.HHZ. 2023-09-29T01:06:25.03 0.6 negative manual P 74 53.6019 50 0.18 47
IV.MCIV.CHZ. 2023-09-29T01:06:24.03 0.6 undecidable manual S 299 24.3534 106 0.62 44
IV.ARCI.HHZ. 2023-09-29T01:06:23.42 0.6 positive manual P 298 42.624 50 0.27 47
IV.BARO.EHZ. 2023-09-29T01:06:23.92 0.6 positive manual P 169 47.9187 50 -0.04 49
IV.SACS.HHZ. 2023-09-29T01:06:21.90 0.3 undecidable manual S 354 19.869 109 -0.01 78
IV.MGAB.HHZ. 2023-09-29T01:06:20.58 0.6 negative manual P 28 30.3474 103 -0.28 48
IV.MCIV.CHZ. 2023-09-29T01:06:19.52 0.1 undecidable manual P 299 24.3534 106 -0.17 100
IV.SACS.HHZ. 2023-09-29T01:06:18.73 0.3 undecidable manual P 354 19.869 109 -0.1 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HHN. ML:1.7 0.00040800000000000005 1.04 AML other m 2023-09-29T01:06:21.44
IV.SACS.HNN. ML:1.8 0.0004665 0.34 AML other m 2023-09-29T01:06:22.44
IV.SACS.HHE. ML:1.8 0.0005715 1.1 AML other m 2023-09-29T01:06:22.14
IV.SACS.HNE. ML:1.9 0.0005980000000000001 1.1 AML other m 2023-09-29T01:06:22.14
IV.MGAB.HHE. ML:1.8 0.0003445 0.44 AML other m 2023-09-29T01:06:25.63
IV.MGAB.HHN. ML:2.0 0.000499 0.18 AML other m 2023-09-29T01:06:28.29
IV.ARCI.HHE. ML:1.3 0.00005865 0.62 AML other m 2023-09-29T01:06:30.84
IV.ARCI.HHN. ML:1.3 0.000058450000000000005 0.5 AML other m 2023-09-29T01:06:31.31
IV.CAFI.HHN. ML:1.4 0.00003305 0.44 AML other m 2023-09-29T01:06:37.74
IV.CAFI.HHE. ML:1.4 0.00003625000000000001 1.62 AML other m 2023-09-29T01:06:40.89
IV.ATMI.HHN. ML:2.1 0.00016499999999999997 0.66 AML other m 2023-09-29T01:06:42.32
IV.ATMI.HHE. ML:2.0 0.0001445 1.16 AML other m 2023-09-29T01:06:44.96
IV.FDMO.HHE. ML:1.4 0.0000263 1.04 AML other m 2023-09-29T01:07:09.95
IV.FDMO.HHN. ML:1.4 0.000023100000000000002 0.3 AML other m 2023-09-29T01:07:10.58
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