Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 18-04-2023 and time 09:30:38 (UTC) in region 3 km W Ferentillo (TR)

A magnitude ML 1.2 earthquake occured in region: 3 km W Ferentillo (TR), on

  • 18-04-2023 09:30:38 (UTC)
  • 18-04-2023 11:30:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6260, 12.7540 at 17 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Ferentillo TR 3 1913 1913
Montefranco TR 3 1276 3189
Arrone TR 5 2763 5952
Polino TR 9 233 6185
Terni TR 11 111501 117686
Labro RI 12 374 118060
Scheggino PG 12 461 118521
Spoleto PG 12 38218 156739
Morro Reatino RI 13 373 157112
Sant'Anatolia di Narco PG 14 564 157676
Colli sul Velino RI 14 533 158209
Rivodutri RI 15 1253 159462
Stroncone TR 16 4917 164379
Monteleone di Spoleto PG 17 599 164978
San Gemini TR 17 5018 169996
Poggio Bustone RI 17 2055 172051
Poggiodomo PG 18 117 172168
Acquasparta TR 18 4778 176946
Vallo di Nera PG 18 364 177310
Leonessa RI 19 2435 179745
Greccio RI 19 1558 181303

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km NE of Terni (111501 inhabitants)
37 Km S of Foligno (57155 inhabitants)
58 Km E of Viterbo (67173 inhabitants)
61 Km NW of L'Aquila (69753 inhabitants)
61 Km SE of Perugia (166134 inhabitants)
70 Km N of Guidonia Montecelio (88673 inhabitants)
74 Km N of Tivoli (56533 inhabitants)
78 Km W of Teramo (54892 inhabitants)
84 Km N of Roma (2864731 inhabitants)
99 Km NE of Civitavecchia (52991 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
Bulletin
Rev1000 		ML 1.2 2023-04-18
09:30:38		 42.6257 12.7543 17 2024-03-01
17:18:16		 Bollettino Sismico Italiano INGV 120744871
Reviewed
Rev100 		ML 1.2 2023-04-18
09:30:38		 42.6288 12.7613 16 2023-04-18
09:45:05		 Sala Sismica INGV-Roma 116484371
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-18 09:30:38 ± 0.06
Latitude 42.6257 ± 0.0027
Longitude 12.7543 ± 0.0037
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 120744871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 280
Semi-minor axis of confidence ellipse (meter) 199
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 49
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.51261
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 116484371
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-18 09:45:05

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 21
Type of magnitude ML
Reference to an origin 120744871
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-07 10:29:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ECTS.HHZ. 2023-04-18T09:32:33.20 3.0 undecidable manual Sn 0.78 0
OX.MPRI.HHZ. 2023-04-18T09:32:30.65 3.0 undecidable manual Sg 10.2 0
IV.ZEN8.EHZ. 2023-04-18T09:32:16.30 3.0 undecidable manual Sg 4.59 0
MN.TRI.HHZ. 2023-04-18T09:32:12.49 3.0 undecidable manual Sg 2.93 0
IV.PTCC.HHZ. 2023-04-18T09:32:11.21 3.0 undecidable manual Sn -9.99 0
GU.GRAM.HHZ. 2023-04-18T09:31:52.36 3.0 undecidable manual Sn -0.79 0
IV.CRJA.HHZ. 2023-04-18T09:31:50.85 3.0 undecidable manual Pg 16.559999 0
GU.GSCL.HHZ. 2023-04-18T09:31:47.47 3.0 undecidable manual Sg 2.53 0
IV.EPZF.HHZ. 2023-04-18T09:31:46.60 3.0 positive manual Pn 8.17 0
IV.GRIS.EHZ. 2023-04-18T09:31:39.07 3.0 undecidable manual Pg 17.16 0
IV.MILZ.HHZ. 2023-04-18T09:31:38.89 3.0 undecidable manual Pn 4.41 0
IV.IMOL.HNZ. 2023-04-18T09:31:37.71 3.0 undecidable manual Sg 1.26 0
IV.GIZZ.HHZ. 2023-04-18T09:31:36.52 3.0 positive manual Pn 4.36 0
IV.TDS.HHZ. 2023-04-18T09:31:32.45 3.0 negative manual Pn 6.05 0
IV.EL6.EHZ. 2023-04-18T09:31:04.56 3.0 undecidable manual Sg -5.83 0
IV.CESI.HHZ. 2023-04-18T09:30:52.63 0.3 undecidable manual S 16 43.8228 101 0.25 67
IV.RM33.EHZ. 2023-04-18T09:30:51.41 0.3 undecidable manual S 109 39.7269 103 0.09 71
IV.NRCA.HHZ. 2023-04-18T09:30:50.49 0.6 undecidable manual S 52 37.3293 104 -0.2 47
IV.MML1.EHZ. 2023-04-18T09:30:48.18 0.3 undecidable manual P 18 56.8986 98 -0.14 68
IV.LNSS.HHZ. 2023-04-18T09:30:47.17 0.3 undecidable manual S 96 23.4543 116 -0.03 74
IV.MOMA.HHZ. 2023-04-18T09:30:47.57 0.6 undecidable manual S 323 24.8529 114 0.04 49
IV.FDMO.HHZ. 2023-04-18T09:30:47.68 0.3 undecidable manual P 31 53.0025 99 -0.04 70
IV.VCEL.EHZ. 2023-04-18T09:30:47.40 3.0 negative manual Pn -0.89 0
IV.CESI.HHZ. 2023-04-18T09:30:46.32 0.1 positive manual P 16 43.8228 101 0 95
IV.ASSB.HHZ. 2023-04-18T09:30:46.76 0.3 undecidable manual P 350 46.9197 100 -0.03 71
IV.NRCA.HHZ. 2023-04-18T09:30:45.20 0.3 undecidable manual P 52 37.3293 104 -0.15 70
IV.RM33.EHZ. 2023-04-18T09:30:45.78 0.3 undecidable manual P 109 39.7269 103 0.06 71
IV.CESX.HHZ. 2023-04-18T09:30:45.01 0.3 undecidable manual S 262 13.7751 134 -0.06 74
IV.GAVE.EHZ. 2023-04-18T09:30:44.82 0.3 undecidable manual S 57 13.5753 135 -0.21 73
IV.ARRO.EHZ. 2023-04-18T09:30:43.94 0.6 undecidable manual S 170 5.2947 160 0.12 50
IV.LNSS.HHZ. 2023-04-18T09:30:43.31 0.3 undecidable manual P 96 23.4543 116 -0.03 74
IV.MOMA.HHZ. 2023-04-18T09:30:43.61 0.3 undecidable manual P 323 24.8529 114 0.08 73
IV.CESX.HHZ. 2023-04-18T09:30:42.04 0.3 undecidable manual P 262 13.7751 134 -0.07 74
IV.GAVE.EHZ. 2023-04-18T09:30:42.10 0.1 undecidable manual P 57 13.5753 135 0.02 100
IV.ARRO.EHZ. 2023-04-18T09:30:41.51 0.3 undecidable manual P 170 5.2947 160 0.13 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:0.8 0.00006725000000000001 0.12 AML other m 2023-04-18T09:30:44.43
IV.GAVE.EHN. ML:1.7 0.000347 0.14 AML other m 2023-04-18T09:30:44.90
IV.CESX.HHN. ML:1.0 0.00007944999999999999 0.42 AML other m 2023-04-18T09:30:45.32
IV.GAVE.HNE. ML:1.8 0.0004335483 0.1856 AML other m 2023-04-18T09:30:45.24
IV.GAVE.EHE. ML:1.7 0.0003965 0.18 AML other m 2023-04-18T09:30:45.24
IV.ARRO.EHE. ML:0.7 0.00004685 0.2 AML other m 2023-04-18T09:30:45.67
IV.CESX.HHE. ML:0.9 0.00005300000000000001 0.56 AML other m 2023-04-18T09:30:47.25
IV.MOMA.HHN. ML:1.0 0.0000567 0.84 AML other m 2023-04-18T09:30:47.84
IV.LNSS.HHE. ML:1.3 0.0001125 0.7 AML other m 2023-04-18T09:30:47.91
IV.MOMA.HHE. ML:1.4 0.00011549999999999999 1.38 AML other m 2023-04-18T09:30:47.94
IV.LNSS.HHN. ML:1.3 0.00011 0.16 AML other m 2023-04-18T09:30:48.41
IV.NRCA.HHE. ML:1.2 0.00005645 0.86 AML other m 2023-04-18T09:30:51.07
IV.NRCA.HHN. ML:1.2 0.00004770000000000001 1.06 AML other m 2023-04-18T09:30:51.66
IV.RM33.EHN. ML:0.9 0.000025679505 0.2176 AML other m 2023-04-18T09:30:52.12
IV.RM33.EHE. ML:1.1 0.00004610065500000001 0.1984 AML other m 2023-04-18T09:30:52.05
IV.CESI.HHE. ML:1.6 0.000116 1.74 AML other m 2023-04-18T09:30:53.94
IV.CESI.HHN. ML:1.7 0.00013450000000000002 1.62 AML other m 2023-04-18T09:30:53.93
IV.FDMO.HHE. ML:1.0 0.00002525 0.9 AML other m 2023-04-18T09:30:54.48
IV.FDMO.HHN. ML:1.1 0.00002855 1.08 AML other m 2023-04-18T09:30:55.27
IV.MMO1.EHN. ML:1.1 0.00002587 1.38 AML other m 2023-04-18T09:30:55.96
IV.MMO1.EHE. ML:1.1 0.00003195 1.48 AML other m 2023-04-18T09:31:02.21
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