Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 18-04-2023 and time 08:46:35 (UTC) in region 8 km SW Serravalle di Chienti (MC)

A magnitude ML 1.2 earthquake occured in region: 8 km SW Serravalle di Chienti (MC), on

  • 18-04-2023 08:46:35 (UTC)
  • 18-04-2023 10:46:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0320, 12.8680 at 8 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
Serravalle di Chienti MC 8 1070 1070
Valtopina PG 10 1398 2468
Nocera Umbra PG 11 5839 8307
Monte Cavallo MC 12 145 8452
Sefro MC 15 422 8874
Pieve Torina MC 15 1458 10332
Muccia MC 16 915 11247
Foligno PG 16 57155 68402
Spello PG 17 8645 77047
Sellano PG 17 1079 78126
Pievebovigliana MC 18 866 78992
Fiordimonte MC 18 202 79194
Fiuminata MC 18 1402 80596
Pioraco MC 19 1134 81730
Trevi PG 20 8469 90199

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km NE of Foligno (57155 inhabitants)
40 Km E of Perugia (166134 inhabitants)
55 Km NE of Terni (111501 inhabitants)
80 Km NW of Teramo (54892 inhabitants)
84 Km SW of Ancona (100861 inhabitants)
87 Km NW of L'Aquila (69753 inhabitants)
91 Km S of Fano (60888 inhabitants)
92 Km NE of Viterbo (67173 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
98 Km S of Pesaro (94582 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 1.2 2023-04-18
08:46:35		 43.0318 12.8682 8 2023-04-18
09:13:21		 Sala Sismica INGV-Roma 116483641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-18 08:46:35 ± 0.05
Latitude 43.0318 ± 0.0027
Longitude 12.8682 ± 0.0037
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 116483641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 271
Semi-minor axis of confidence ellipse (meter) 251
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 42
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 50
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.03777
Epicentral distance of station farthest from the epicenter (degree) 0.44696
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 116483641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-18 09:13:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2023-04-18T08:46:48.89 0.6 undecidable manual S 30 38.0286 50 -0.06 64
IV.GAVE.EHZ. 2023-04-18T08:46:48.78 0.3 undecidable manual S 177 37.7289 50 -0.1 96
IV.MOMA.HHZ. 2023-04-18T08:46:48.56 0.6 undecidable manual S 224 35.0427 50 0.4 60
IV.NRCA.HHZ. 2023-04-18T08:46:46.33 0.3 undecidable manual S 138 29.748 105 -0.06 98
IV.CSP1.EHZ. 2023-04-18T08:46:46.02 0.6 undecidable manual S 76 28.0497 106 0.18 64
IV.LNSS.HHE. 2023-04-18T08:46:44.91 0.3 undecidable manual P 164 49.617 50 -0.23 91
IV.SSFR.HHN. 2023-04-18T08:46:44.36 0.3 undecidable manual P 351 45.4212 50 -0.13 94
IV.ATCC.EHZ. 2023-04-18T08:46:44.59 0.3 undecidable manual S 313 25.1526 108 -0.27 95
IV.EL6.EHZ. 2023-04-18T08:46:43.10 0.3 undecidable manual P 30 38.0286 50 -0.25 93
IV.GAVE.EHZ. 2023-04-18T08:46:43.28 0.3 undecidable manual P 177 37.7289 50 -0.03 97
IV.MURB.HHZ. 2023-04-18T08:46:43.34 0.6 undecidable manual P 313 37.8288 50 0.02 65
IV.MOMA.HHZ. 2023-04-18T08:46:42.89 0.6 undecidable manual P 224 35.0427 50 0 65
IV.FDMO.HHZ. 2023-04-18T08:46:42.54 0.3 undecidable manual S 88 17.7711 115 0.06 100
IV.FEMA.HNZ. 2023-04-18T08:46:42.40 0.6 undecidable manual S 118 16.6722 116 0.28 64
IV.ASSB.HHZ. 2023-04-18T08:46:42.50 0.3 undecidable manual S 274 17.0718 116 0.26 96
IV.ATCC.EHZ. 2023-04-18T08:46:41.14 0.6 positive manual P 313 25.1526 108 0.16 65
IV.NRCA.HHZ. 2023-04-18T08:46:41.71 0.3 undecidable manual P 138 29.748 105 -0.16 96
IV.CSP1.EHZ. 2023-04-18T08:46:41.64 0.3 negative manual P 76 28.0497 106 0.09 98
IV.MML1.HNZ. 2023-04-18T08:46:40.82 0.6 undecidable manual S 43 12.3765 123 0 68
IT.MTCL.HGZ. 2023-04-18T08:46:40.71 0.3 undecidable manual S 112 11.4774 125 0.14 99
IV.ASSB.HHZ. 2023-04-18T08:46:39.66 0.3 undecidable manual P 274 17.0718 116 0.18 98
IV.FDMO.HHZ. 2023-04-18T08:46:39.78 0.3 undecidable manual P 88 17.7711 115 0.17 98
IV.FEMA.HNZ. 2023-04-18T08:46:39.69 0.6 undecidable manual P 118 16.6722 116 0.28 64
IV.CESI.HHZ. 2023-04-18T08:46:38.23 0.3 undecidable manual S 135 4.1958 153 -0.64 88
IV.MML1.HNZ. 2023-04-18T08:46:38.78 0.3 undecidable manual P 43 12.3765 123 0.12 100
IT.MTCL.HGZ. 2023-04-18T08:46:38.65 0.3 undecidable manual P 112 11.4774 125 0.14 99
IV.CESI.HHZ. 2023-04-18T08:46:37.35 0.3 undecidable manual P 135 4.1958 153 -0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:0.0 0.00023051519999999997 0.1856 AML other m 2023-04-18T08:46:39.93
IV.CESI.HHE. ML:0.0 0.00025602750000000004 0.1984 AML other m 2023-04-18T08:46:39.07
IV.ASSB.HHN. ML:1.3 0.000165 0.18 AML other m 2023-04-18T08:46:42.61
IV.FDMO.HHE. ML:1.3 0.000167 0.14 AML other m 2023-04-18T08:46:42.75
IV.FDMO.HHN. ML:1.2 0.000124 0.2 AML other m 2023-04-18T08:46:42.83
IV.ASSB.HHE. ML:1.1 0.0001214935 0.1984 AML other m 2023-04-18T08:46:43.21
IV.NRCA.HHE. ML:1.0 0.0000572 0.78 AML other m 2023-04-18T08:46:46.90
IV.MURB.HHN. ML:1.2 0.000061 0.18 AML other m 2023-04-18T08:46:50.74
IV.MURB.HHE. ML:1.3 0.00006845000000000001 0.38 AML other m 2023-04-18T08:46:53.60
IV.NRCA.HHN. ML:1.3 0.00009995 0.08 AML other m 2023-04-18T08:46:53.95
IV.CESI.HNE. ML:0.0 0.00027286345 0.2304 AML other m 2023-04-18T08:46:39.18
IV.CESI.HNN. ML:0.0 0.0002128896 0.192 AML other m 2023-04-18T08:46:40.02
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