Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 28-09-2023 and time 23:22:04 (Italy) in region 2 km E San Lorenzo Nuovo (VT)

A magnitude ML 2.1 earthquake occured in region: 2 km E San Lorenzo Nuovo (VT), on

  • 28-09-2023 21:22:04 (UTC)
  • 28-09-2023 23:22:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6810, 11.9300 at 3 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 2 2091 2091
Grotte di Castro VT 5 2683 4774
Castel Giorgio TR 5 2131 6905
Bolsena VT 6 3991 10896
Gradoli VT 7 1353 12249
Acquapendente VT 9 5506 17755
Onano VT 10 995 18750
Latera VT 10 836 19586
Castel Viscardo TR 10 2938 22524
Proceno VT 12 557 23081
Porano TR 14 1966 25047
Capodimonte VT 15 1731 26778
Allerona TR 15 1794 28572
Bagnoregio VT 15 3650 32222
Orvieto TR 15 20630 52852
Valentano VT 15 2868 55720
Lubriano VT 15 909 56629
Marta VT 16 3499 60128
Sorano GR 18 3428 63556
Montefiascone VT 18 13432 76988
Piansano VT 20 2079 79067

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of Viterbo (67173 inhabitants)
60 Km W of Terni (111501 inhabitants)
60 Km SW of Perugia (166134 inhabitants)
66 Km N of Civitavecchia (52991 inhabitants)
67 Km E of Grosseto (82087 inhabitants)
70 Km W of Foligno (57155 inhabitants)
86 Km SE of Siena (53903 inhabitants)
88 Km S of Arezzo (99543 inhabitants)
99 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 2.1 2023-09-28
21:22:04		 42.6812 11.9302 3 2023-09-28
21:33:26		 Sala Sismica INGV-Roma 121561001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-28 21:22:04 ± 0.11
Latitude 42.6812 ± 0.0054
Longitude 11.9302 ± 0.0061
Depth (km) 3 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121561001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 630
Semi-minor axis of confidence ellipse (meter) 510
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 32
Circular confidence region, given by single value of horizontal uncertainty (meter) 630.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.96767
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 14
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 46
Type of magnitude ML
Reference to an origin 121561001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-28 21:33:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CH.BERNI.HHZ. 2023-09-28T21:23:49.29 3.0 undecidable manual Sn -3.16 0
OX.MPRI.HHZ. 2023-09-28T21:23:43.37 3.0 undecidable manual Sn -0.73 0
IV.CMPR.HHZ. 2023-09-28T21:23:35.71 3.0 undecidable manual Sn -5.1 0
7C.SPAOL.HNZ. 2023-09-28T21:23:26.50 3.0 negative manual Pn -2.46 0
GU.TRAV.HHZ. 2023-09-28T21:23:08.80 3.0 undecidable manual Pn 1.25 0
IV.CDRU.HHZ. 2023-09-28T21:23:08.94 3.0 undecidable manual Pg 11.93 0
OX.VARN.HHZ. 2023-09-28T21:23:05.94 3.0 undecidable manual Pg 9.92 0
IV.MF5.EHZ. 2023-09-28T21:22:44.73 3.0 undecidable manual S 0.74 0
IV.CASP.HHZ. 2023-09-28T21:22:32.02 1.0 undecidable manual S 278 87.6456 50 0.28 22
IV.ATMI.HHZ. 2023-09-28T21:22:28.43 3.0 undecidable manual S -0.56 0
IV.CAFI.HHZ. 2023-09-28T21:22:27.49 3.0 undecidable manual S 0.09 0
IV.MPAG.EHZ. 2023-09-28T21:22:26.75 3.0 negative manual P 0.77 0
IV.ARVD.HHZ. 2023-09-28T21:22:26.68 3.0 positive manual P 0.99 0
IV.CSP1.EHZ. 2023-09-28T21:22:24.78 3.0 positive manual P 0.34 0
IV.PARC.HHZ. 2023-09-28T21:22:23.46 3.0 negative manual P -0.28 0
IV.FDMO.HHZ. 2023-09-28T21:22:22.88 1.0 negative manual P 67 102.0201 50 0.63 19
IV.FIAM.HHZ. 2023-09-28T21:22:22.96 0.6 undecidable manual P 115 107.4147 50 -0.12 43
IV.NRCA.HHZ. 2023-09-28T21:22:21.91 0.6 undecidable manual P 80 97.9242 50 0.29 43
IV.ATPI.EHZ. 2023-09-28T21:22:21.84 3.0 undecidable manual P 0.88 0
IV.BARO.EHZ. 2023-09-28T21:22:20.81 0.6 undecidable manual S 168 49.1175 93 -0.27 47
IV.CASP.HHZ. 2023-09-28T21:22:20.36 0.6 undecidable manual P 278 87.6456 50 0.33 43
IV.RIBO.EHZ.01 2023-09-28T21:22:19.55 0.6 undecidable manual P 293 77.7666 50 1.03 34
IV.ATVO.HHZ. 2023-09-28T21:22:19.37 3.0 undecidable manual P -0.47 0
IV.ARCI.HHZ. 2023-09-28T21:22:18.45 0.6 undecidable manual S 297 41.625 94 -0.04 50
IV.ATCC.EHZ. 2023-09-28T21:22:18.54 1.0 negative manual P 46 80.2641 50 -0.36 22
IV.ATMI.HHZ. 2023-09-28T21:22:17.75 3.0 positive manual P -0.52 0
IV.ASSB.HHZ. 2023-09-28T21:22:17.70 0.3 positive manual P 56 71.5728 50 0.15 69
IV.CAFI.HHZ. 2023-09-28T21:22:16.53 3.0 positive manual P -0.85 0
IV.MGAB.HHZ. 2023-09-28T21:22:14.70 0.6 undecidable manual S 30 29.6481 95 0.34 48
IV.MOMA.HHZ. 2023-09-28T21:22:14.50 0.6 negative manual P 75 53.9016 50 -0.33 46
IV.BARO.EHZ. 2023-09-28T21:22:13.26 1.0 positive manual P 168 49.1175 93 -0.62 21
TV.SF11.HHZ. 2023-09-28T21:22:13.72 0.6 undecidable manual S 316 29.1486 95 -0.47 46
IV.MCIV.CHZ. 2023-09-28T21:22:12.23 0.6 undecidable manual S 298 23.3544 97 0.05 51
IV.ARCI.HHZ. 2023-09-28T21:22:11.89 1.0 undecidable manual P 297 41.625 94 -0.49 23
IV.SACS.HNZ. 2023-09-28T21:22:10.04 0.3 undecidable manual S 355 18.6702 98 -0.55 69
TV.SF11.HHZ. 2023-09-28T21:22:09.88 0.6 undecidable manual P 316 29.1486 95 -0.02 51
IV.MGAB.HHZ. 2023-09-28T21:22:09.87 0.1 positive manual P 30 29.6481 95 -0.13 100
IV.SACS.HNZ. 2023-09-28T21:22:08.27 0.3 negative manual P 355 18.6702 98 0.46 71
IV.MCIV.CHZ. 2023-09-28T21:22:08.76 0.3 undecidable manual P 298 23.3544 97 0.02 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCIV.CHE. ML:2.0 0.0007695000000000001 1.08 AML other m 2023-09-28T21:22:13.55
IV.SACS.HHE. ML:2.2 0.00133 1.26 AML other m 2023-09-28T21:22:13.98
IV.SACS.HNE. ML:2.2 0.0014750000000000002 1.26 AML other m 2023-09-28T21:22:13.98
IV.SACS.HHN. ML:2.1 0.00113 0.56 AML other m 2023-09-28T21:22:13.97
IV.SACS.HNN. ML:2.0 0.0010095 0.56 AML other m 2023-09-28T21:22:13.97
IV.MGAB.HHN. ML:2.4 0.001345 0.34 AML other m 2023-09-28T21:22:15.20
IV.MGAB.HNN. ML:2.4 0.00122 0.36 AML other m 2023-09-28T21:22:15.20
TV.SF11.HHE. ML:2.2 0.0009915 0.36 AML other m 2023-09-28T21:22:15.82
IV.MGAB.HHE. ML:2.4 0.00124 0.74 AML other m 2023-09-28T21:22:16.84
IV.MGAB.HNE. ML:2.3 0.001145 1.38 AML other m 2023-09-28T21:22:16.84
TV.SF11.HHN. ML:2.2 0.000976 0.38 AML other m 2023-09-28T21:22:17.45
IV.MCIV.CHN. ML:1.9 0.000604 0.96 AML other m 2023-09-28T21:22:20.24
IV.ARCI.HHN. ML:2.0 0.00030300000000000005 0.68 AML other m 2023-09-28T21:22:20.43
IV.ARCI.HHE. ML:1.9 0.0002475 1.44 AML other m 2023-09-28T21:22:23.83
IV.BARO.HNE. ML:2.1 0.00035499999999999996 0.46 AML other m 2023-09-28T21:22:23.90
IV.MOMA.HHN. ML:2.0 0.000248 1.56 AML other m 2023-09-28T21:22:25.90
IV.BARO.HNN. ML:2.0 0.0002635 0.98 AML other m 2023-09-28T21:22:25.69
IV.MOMA.HHE. ML:2.0 0.00026949999999999994 0.22 AML other m 2023-09-28T21:22:26.63
IV.CAFI.HHN. ML:1.9 0.0001255 1.48 AML other m 2023-09-28T21:22:30.08
IV.CAFI.HHE. ML:1.9 0.000135 1.4 AML other m 2023-09-28T21:22:30.19
IV.ASSB.HHN. ML:1.8 0.00010725 0.84 AML other m 2023-09-28T21:22:31.40
IV.ATMI.HHN. ML:2.5 0.0005255 0.36 AML other m 2023-09-28T21:22:31.86
IV.ATCC.HNN. ML:2.3 0.000303 0.82 AML other m 2023-09-28T21:22:32.54
IV.ATCC.EHN. ML:2.3 0.0002635 0.8 AML other m 2023-09-28T21:22:32.96
IV.ATCC.EHE. ML:2.3 0.00026250000000000004 0.5 AML other m 2023-09-28T21:22:32.47
IV.ATCC.HNE. ML:2.3 0.00026700000000000004 0.64 AML other m 2023-09-28T21:22:32.74
IV.ASSB.HHE. ML:1.8 0.00010955 0.38 AML other m 2023-09-28T21:22:34.42
IV.ATMI.HHE. ML:2.5 0.000523 0.34 AML other m 2023-09-28T21:22:34.35
IV.CASP.HHE. ML:1.6 0.0000497 1.18 AML other m 2023-09-28T21:22:35.15
IV.ATVO.HHE. ML:2.2 0.0001895 0.56 AML other m 2023-09-28T21:22:35.72
IV.ATVO.HHN. ML:2.0 0.00014000000000000001 0.38 AML other m 2023-09-28T21:22:36.76
IV.ATPI.EHN. ML:2.0 0.00011485 1.2 AML other m 2023-09-28T21:22:37.02
IV.ATPI.EHE. ML:2.0 0.0001081 1.22 AML other m 2023-09-28T21:22:37.02
IV.CASP.HHN. ML:1.7 0.0000603 0.7 AML other m 2023-09-28T21:22:37.45
IV.FDMO.HHE. ML:1.8 0.0000555 0.38 AML other m 2023-09-28T21:22:39.37
IV.FDMO.HHN. ML:1.7 0.00004605 0.68 AML other m 2023-09-28T21:22:39.58
IV.NRCA.HHN. ML:1.8 0.00007075000000000001 1.44 AML other m 2023-09-28T21:22:39.25
IV.NRCA.HHE. ML:1.9 0.000077 0.7 AML other m 2023-09-28T21:22:41.50
IV.CSP1.EHE. ML:2.2 0.0001415 0.58 AML other m 2023-09-28T21:22:45.39
IV.PARC.HHN. ML:1.8 0.00005565 0.92 AML other m 2023-09-28T21:22:45.53
IV.ARVD.HHE. ML:1.8 0.00004645 0.5 AML other m 2023-09-28T21:22:45.53
IV.CSP1.EHN. ML:2.4 0.000203 0.42 AML other m 2023-09-28T21:22:45.45
IV.ARVD.HHN. ML:1.8 0.00004355 0.6 AML other m 2023-09-28T21:22:46.55
IV.PARC.HHE. ML:2.0 0.00007929999999999999 0.68 AML other m 2023-09-28T21:22:47.38
IV.MPAG.EHE. ML:1.8 0.000039800000000000005 0.42 AML other m 2023-09-28T21:22:48.21
IV.MPAG.EHN. ML:1.8 0.00004770000000000001 0.4 AML other m 2023-09-28T21:22:50.40
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