Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 28-09-2023 and time 19:59:31 (Italy) in region 1 km E San Lorenzo Nuovo (VT)

A magnitude ML 2.1 earthquake occured in region: 1 km E San Lorenzo Nuovo (VT), on

  • 28-09-2023 17:59:31 (UTC)
  • 28-09-2023 19:59:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6870, 11.9240 at 11 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 1 2091 2091
Grotte di Castro VT 5 2683 4774
Castel Giorgio TR 5 2131 6905
Bolsena VT 7 3991 10896
Gradoli VT 7 1353 12249
Acquapendente VT 8 5506 17755
Onano VT 9 995 18750
Castel Viscardo TR 10 2938 21688
Latera VT 10 836 22524
Proceno VT 11 557 23081
Porano TR 15 1966 25047
Allerona TR 15 1794 26841
Capodimonte VT 15 1731 28572
Orvieto TR 16 20630 49202
Valentano VT 16 2868 52070
Bagnoregio VT 16 3650 55720
Lubriano VT 16 909 56629
Marta VT 17 3499 60128
Sorano GR 17 3428 63556
Montefiascone VT 19 13432 76988

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of Viterbo (67173 inhabitants)
60 Km SW of Perugia (166134 inhabitants)
61 Km W of Terni (111501 inhabitants)
67 Km E of Grosseto (82087 inhabitants)
67 Km N of Civitavecchia (52991 inhabitants)
70 Km W of Foligno (57155 inhabitants)
85 Km SE of Siena (53903 inhabitants)
87 Km S of Arezzo (99543 inhabitants)
100 Km NW of Roma (2864731 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
17:59:31		 42.6872 11.9242 11 2023-09-28
18:08:22		 Sala Sismica INGV-Roma 121551731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-28 17:59:31 ± 0.18
Latitude 42.6872 ± 0.0072
Longitude 11.9242 ± 0.0098
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121551731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 752
Semi-minor axis of confidence ellipse (meter) 698
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 254
Circular confidence region, given by single value of horizontal uncertainty (meter) 750.0
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 44
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78421
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 13
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 54
Type of magnitude ML
Reference to an origin 121551731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-28 18:08:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TDS.HHZ. 2023-09-28T18:01:15.87 3.0 undecidable manual Sn -8.9 0
OX.SABO.HNZ. 2023-09-28T18:01:11.93 3.0 undecidable manual Sn -2.82 0
IV.PZUN.HHZ. 2023-09-28T18:01:07.76 3.0 undecidable manual Sg 3.62 0
MN.TRI.HHZ. 2023-09-28T18:01:01.26 3.0 undecidable manual Sn -8.43 0
GU.GBOS.HHZ. 2023-09-28T18:00:48.25 3.0 undecidable manual Sn -2.27 0
GU.TRAV.HHZ. 2023-09-28T18:00:40.21 3.0 undecidable manual Pg 16.93 0
IV.BSSO.HHZ. 2023-09-28T18:00:25.82 3.0 undecidable manual Sn -9.68 0
IV.PZUN.HHZ. 2023-09-28T18:00:12.41 3.0 positive manual Pn -5.32 0
IV.MELA.HHZ. 2023-09-28T18:00:07.30 3.0 negative manual Pg 0.76 0
IV.SGG.HHZ. 2023-09-28T18:00:04.80 3.0 negative manual Pg 4.66 0
IV.ATPI.EHZ. 2023-09-28T18:00:01.52 3.0 undecidable manual Sn -8.61 0
IV.SEI.HHZ. 2023-09-28T17:59:59.61 3.0 undecidable manual Pg 7.65 0
IV.SRES.HHZ. 2023-09-28T17:59:52.35 0.6 undecidable manual S 136 69.1752 50 -0.05 47
IV.ARVD.HHZ. 2023-09-28T17:59:51.63 3.0 positive manual Pg 0.3 0
IV.CSP1.EHZ. 2023-09-28T17:59:51.43 3.0 positive manual Pg 1.54 0
IV.PARC.HHZ. 2023-09-28T17:59:50.61 3.0 undecidable manual Pg 1.74 0
IV.CRE.HHZ. 2023-09-28T17:59:49.88 3.0 undecidable manual Pg 2.55 0
IV.ATPI.EHZ. 2023-09-28T17:59:48.74 3.0 negative manual Pg 1.35 0
IV.MML1.EHZ. 2023-09-28T17:59:48.76 3.0 positive manual Pg 0.65 0
IV.MOMA.HHZ. 2023-09-28T17:59:48.83 0.3 undecidable manual S 76 54.2013 50 0.44 67
IV.BARO.EHZ. 2023-09-28T17:59:47.05 0.3 undecidable manual S 168 49.8168 50 -0.17 71
IV.ATFO.HHZ. 2023-09-28T17:59:47.03 3.0 undecidable manual Pg -0.47 0
IV.CASP.HHZ. 2023-09-28T17:59:47.02 0.1 undecidable manual P 278 87.0462 50 0.73 75
IV.ATVO.HHZ. 2023-09-28T17:59:46.53 3.0 negative manual Pg -0.12 0
IV.ATMI.HHZ. 2023-09-28T17:59:46.19 3.0 positive manual Pg 0.88 0
IV.ATCC.EHZ. 2023-09-28T17:59:45.35 0.6 undecidable manual P 46 80.1642 50 0.12 45
IV.RIBO.EHZ.01 2023-09-28T17:59:45.34 0.6 undecidable manual P 292 77.0673 50 0.58 41
IV.SRES.HHZ. 2023-09-28T17:59:44.17 0.3 undecidable manual P 136 69.1752 50 0.63 61
IV.ASSB.HHZ. 2023-09-28T17:59:44.00 0.6 undecidable manual P 56 71.5728 50 0.09 46
IV.CAFI.HHZ. 2023-09-28T17:59:43.61 3.0 positive manual Pg -0.13 0
IV.MGAB.HHZ. 2023-09-28T17:59:42.04 0.6 undecidable manual S 31 29.3484 50 0.28 48
IV.MOMA.HHZ. 2023-09-28T17:59:41.15 1.0 undecidable manual P 76 54.2013 50 -0.08 24
TV.SF11.HHZ. 2023-09-28T17:59:40.84 0.1 undecidable manual S 315 28.3494 50 -0.66 86
IV.BARO.EHZ. 2023-09-28T17:59:40.15 0.1 undecidable manual P 168 49.8168 50 -0.41 91
IV.MCIV.CHZ. 2023-09-28T17:59:40.39 0.6 undecidable manual S 297 22.5552 50 0.43 47
IV.NRCA.HHZ. 2023-09-28T17:59:39.78 3.0 negative manual Pn -7.62 0
IV.ORTE.EHE. 2023-09-28T17:59:39.42 0.6 undecidable manual P 124 45.2214 50 -0.43 46
IV.ARCI.HHZ. 2023-09-28T17:59:39.70 1.0 positive manual P 297 40.8258 50 0.52 22
IV.SACS.HNZ. 2023-09-28T17:59:38.89 0.1 undecidable manual S 356 17.9709 50 0.16 100
TV.SF11.HHZ. 2023-09-28T17:59:37.09 0.1 undecidable manual P 315 28.3494 50 -0.16 99
IV.MGAB.HHZ. 2023-09-28T17:59:36.88 0.1 positive manual P 31 29.3484 50 -0.52 92
IV.MCIV.CHZ. 2023-09-28T17:59:36.32 0.6 positive manual P 297 22.5552 50 -0.04 51
IV.CERT.HHZ. 2023-09-28T17:59:36.64 3.0 undecidable manual P -7.64 0
IV.SACS.HNZ. 2023-09-28T17:59:35.37 0.3 negative manual P 356 17.9709 50 -0.28 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HNN. ML:2.4 0.00229 0.3 AML other m 2023-09-28T17:59:39.09
IV.SACS.HNE. ML:2.5 0.00242 0.38 AML other m 2023-09-28T17:59:39.31
IV.SACS.HHE. ML:2.4 0.002215 0.38 AML other m 2023-09-28T17:59:39.32
IV.SACS.HHN. ML:2.5 0.0025800000000000003 0.88 AML other m 2023-09-28T17:59:39.10
IV.MCIV.CHE. ML:2.4 0.0015249999999999999 0.28 AML other m 2023-09-28T17:59:42.51
IV.MGAB.HHN. ML:2.5 0.0015699999999999998 0.2 AML other m 2023-09-28T17:59:42.84
IV.MGAB.HNN. ML:2.5 0.001435 0.2 AML other m 2023-09-28T17:59:42.85
IV.MCIV.CHN. ML:2.2 0.0010115 0.2 AML other m 2023-09-28T17:59:42.87
TV.SF11.HHE. ML:2.4 0.001265 0.26 AML other m 2023-09-28T17:59:43.24
TV.SF11.HHN. ML:2.3 0.0011400000000000002 0.46 AML other m 2023-09-28T17:59:46.31
IV.MGAB.HNE. ML:2.3 0.0009590000000000001 0.42 AML other m 2023-09-28T17:59:46.44
IV.MGAB.HHE. ML:2.3 0.000976 0.22 AML other m 2023-09-28T17:59:46.45
IV.BARO.HNE. ML:2.1 0.0003485 0.28 AML other m 2023-09-28T17:59:47.22
IV.ARCI.HHN. ML:1.9 0.00026849999999999997 1.44 AML other m 2023-09-28T17:59:48.84
IV.BARO.EHE. ML:1.3 0.0000567 0.26 AML other m 2023-09-28T17:59:48.70
IV.ARCI.HHE. ML:1.9 0.000243 0.38 AML other m 2023-09-28T17:59:49.90
IV.MOMA.HNN. ML:2.0 0.00023199999999999997 0.28 AML other m 2023-09-28T17:59:50.62
IV.BARO.HNN. ML:2.2 0.00039850000000000004 0.4 AML other m 2023-09-28T17:59:52.60
IV.MOMA.HHN. ML:1.9 0.000201 0.68 AML other m 2023-09-28T17:59:53.56
IV.MOMA.HNE. ML:2.2 0.00033350000000000003 0.28 AML other m 2023-09-28T17:59:53.09
IV.MOMA.HHE. ML:2.1 0.00028500000000000004 0.22 AML other m 2023-09-28T17:59:53.23
IV.BARO.EHN. ML:2.2 0.00039 0.46 AML other m 2023-09-28T17:59:54.31
IV.SRES.HHE. ML:1.8 0.000122 0.96 AML other m 2023-09-28T17:59:55.99
IV.CAFI.HHE. ML:2.0 0.000175 1.36 AML other m 2023-09-28T17:59:55.96
IV.CAFI.HHN. ML:2.0 0.000149 1.56 AML other m 2023-09-28T17:59:56.83
IV.SRES.HHN. ML:1.9 0.00013800000000000002 1.56 AML other m 2023-09-28T17:59:56.09
IV.ATMI.HHE. ML:2.6 0.0005875 0.32 AML other m 2023-09-28T17:59:57.23
IV.ASSB.HHN. ML:2.0 0.000152 0.38 AML other m 2023-09-28T17:59:58.54
IV.CERT.HHN. ML:1.8 0.000042550000000000004 0.44 AML other m 2023-09-28T17:59:58.96
IV.ATMI.HHN. ML:2.6 0.000575 1.02 AML other m 2023-09-28T17:59:59.30
IV.CERT.HHE. ML:2.0 0.00007600000000000002 0.6 AML other m 2023-09-28T17:59:59.90
IV.ATCC.EHE. ML:2.5 0.0003985 0.6 AML other m 2023-09-28T18:00:00.40
IV.ATVO.HHN. ML:2.0 0.00013550000000000001 1.6 AML other m 2023-09-28T18:00:00.18
IV.ASSB.HHE. ML:1.9 0.000128 1.32 AML other m 2023-09-28T18:00:00.28
IV.CASP.HHN. ML:1.8 0.00007915 1.02 AML other m 2023-09-28T18:00:01.06
IV.ATVO.HHE. ML:2.2 0.000216 1.08 AML other m 2023-09-28T18:00:01.03
IV.CASP.HHE. ML:1.7 0.00006575 1.04 AML other m 2023-09-28T18:00:01.29
IV.ATFO.HHN. ML:2.4 0.000273 0.5 AML other m 2023-09-28T18:00:02.04
IV.ATCC.EHN. ML:2.3 0.0002635 0.6 AML other m 2023-09-28T18:00:02.36
IV.ATFO.HHE. ML:2.2 0.00016949999999999997 0.58 AML other m 2023-09-28T18:00:02.99
IV.ATPI.EHN. ML:2.1 0.00014600000000000003 1.56 AML other m 2023-09-28T18:00:04.94
IV.ATPI.EHE. ML:2.1 0.000133 1.2 AML other m 2023-09-28T18:00:04.20
IV.MML1.EHN. ML:1.8 0.0000722 1.02 AML other m 2023-09-28T18:00:06.35
IV.MML1.EHE. ML:2.0 0.00010300000000000001 0.8 AML other m 2023-09-28T18:00:06.07
IV.NRCA.HHN. ML:1.9 0.0000852 0.94 AML other m 2023-09-28T18:00:07.60
IV.CRE.HHE. ML:1.8 0.0000575 0.38 AML other m 2023-09-28T18:00:07.59
IV.CSP1.EHN. ML:2.6 0.000287 0.42 AML other m 2023-09-28T18:00:08.35
IV.PARC.HHN. ML:1.9 0.00007085 1 AML other m 2023-09-28T18:00:08.24
IV.NRCA.HHE. ML:1.9 0.0000831 0.94 AML other m 2023-09-28T18:00:08.42
IV.CRE.HHN. ML:2.0 0.00008484999999999999 0.78 AML other m 2023-09-28T18:00:09.71
IV.CSP1.EHE. ML:2.7 0.0003745 0.56 AML other m 2023-09-28T18:00:10.63
IV.ARVD.HHN. ML:1.9 0.000053150000000000004 1.56 AML other m 2023-09-28T18:00:12.96
IV.PARC.HHE. ML:1.9 0.0000726 1.34 AML other m 2023-09-28T18:00:15.83
IV.ARVD.HHE. ML:1.9 0.00006110000000000001 1.12 AML other m 2023-09-28T18:00:17.91
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