Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 23-10-2021 and time 19:31:47 (Italy) in region 5 km S Gualdo Tadino (PG)

A magnitude ML 1.2 earthquake occured in region: 5 km S Gualdo Tadino (PG), on

  • 23-10-2021 17:31:47 (UTC)
  • 23-10-2021 19:31:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1830, 12.7800 at 18 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
Gualdo Tadino PG 5 15208 15208
Nocera Umbra PG 8 5839 21047
Fiuminata MC 12 1402 22449
Fossato di Vico PG 13 2840 25289
Valtopina PG 14 1398 26687
Sefro MC 14 422 27109
Valfabbrica PG 15 3389 30498
Esanatoglia MC 16 2034 32532
Pioraco MC 17 1134 33666
Sigillo PG 17 2404 36070
Assisi PG 18 28299 64369
Serravalle di Chienti MC 19 1070 65439
Fabriano AN 20 31480 96919

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km N of Foligno (57155 inhabitants)
33 Km E of Perugia (166134 inhabitants)
70 Km N of Terni (111501 inhabitants)
76 Km S of Fano (60888 inhabitants)
77 Km SW of Ancona (100861 inhabitants)
79 Km E of Arezzo (99543 inhabitants)
82 Km S of Pesaro (94582 inhabitants)
95 Km NW of Teramo (54892 inhabitants)
99 Km S of Rimini (147750 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 2021-10-23
17:31:47		 43.1832 12.78 18 2021-10-23
17:41:34		 Sala Sismica INGV-Roma 96914171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 17:31:47 ± 0.07
Latitude 43.1832 ± 0.0027
Longitude 12.7800 ± 0.0037
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96914171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 316
Semi-minor axis of confidence ellipse (meter) 117
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 55
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.10252
Epicentral distance of station farthest from the epicenter (degree) 0.49732
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 96914171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 17:41:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MMO1.EHZ. 2021-10-23T17:32:05.22 0.6 undecidable manual S 125 54.4011 99 0.31 44
IV.MPAG.EHZ. 2021-10-23T17:32:04.00 0.3 undecidable manual S 358 49.5171 100 0.36 66
IV.NRCA.HHZ. 2021-10-23T17:32:03.17 0.3 undecidable manual S 145 47.3193 101 0.12 69
IV.PIEI.HHZ. 2021-10-23T17:32:02.17 0.3 undecidable manual S 333 43.8228 102 0.03 71
IV.CSP1.EHZ. 2021-10-23T17:32:00.42 0.3 undecidable manual S 106 35.8419 105 0.35 67
IV.FRON.EHZ. 2021-10-23T17:32:00.17 0.3 undecidable manual S 353 37.4292 105 -0.3 68
IV.EL6.EHZ. 2021-10-23T17:31:59.02 0.3 undecidable manual S 58 30.6471 109 0.28 69
IV.FDMO.HHZ. 2021-10-23T17:31:58.59 0.3 undecidable manual S 123 29.748 110 0.08 72
IV.MMO1.EHZ. 2021-10-23T17:31:57.64 0.3 undecidable manual P 125 54.4011 99 -0.04 69
IV.MPAG.EHZ. 2021-10-23T17:31:57.36 0.1 undecidable manual P 358 49.5171 100 0.41 87
IV.MURB.HHZ. 2021-10-23T17:31:57.14 0.3 undecidable manual S 293 22.4553 118 0.4 68
IV.GAVE.EHZ. 2021-10-23T17:31:57.82 0.6 undecidable manual P 170 55.2003 99 0 47
IV.ATSC.EHZ. 2021-10-23T17:31:57.85 0.3 undecidable manual S 344 27.75 112 -0.17 71
IV.CESI.HHZ. 2021-10-23T17:31:56.70 0.3 undecidable manual S 153 22.1556 118 0.03 74
IV.NRCA.HHZ. 2021-10-23T17:31:56.41 0.1 undecidable manual P 145 47.3193 101 -0.2 91
IV.NARO.HHZ. 2021-10-23T17:31:56.85 0.3 undecidable manual P 341 50.1165 100 -0.18 68
IV.PIEI.HHZ. 2021-10-23T17:31:55.88 0.1 undecidable manual P 333 43.8228 102 -0.21 91
IV.MML1.EHZ. 2021-10-23T17:31:55.46 0.3 undecidable manual S 116 17.3715 127 -0.12 73
IV.FRON.EHZ. 2021-10-23T17:31:55.09 0.3 undecidable manual P 353 37.4292 105 -0.03 72
IV.ASSB.HHZ. 2021-10-23T17:31:55.78 0.3 undecidable manual S 212 18.4704 125 -0.03 74
IV.ATCC.EHZ. 2021-10-23T17:31:54.54 0.3 undecidable manual S 271 11.3775 141 0.12 74
IV.EL6.EHZ. 2021-10-23T17:31:54.07 0.1 undecidable manual P 58 30.6471 109 -0.05 96
IV.SNTG.HHZ. 2021-10-23T17:31:54.88 0.3 undecidable manual S 58 15.2736 131 -0.27 71
IV.CSP1.EHZ. 2021-10-23T17:31:54.91 0.3 undecidable manual P 106 35.8419 105 0.02 72
IV.FDMO.HHZ. 2021-10-23T17:31:53.84 0.1 undecidable manual P 123 29.748 110 -0.15 95
IT.MTCL.HGZ. 2021-10-23T17:31:53.55 0.1 undecidable manual P 140 27.4503 112 -0.12 96
IV.MURB.HHZ. 2021-10-23T17:31:53.06 0.1 undecidable manual P 293 22.4553 118 0.09 97
IV.ATSC.EHZ. 2021-10-23T17:31:53.50 0.3 undecidable manual P 344 27.75 112 -0.21 70
IV.MML1.EHZ. 2021-10-23T17:31:52.19 0.1 undecidable manual P 116 17.3715 127 -0.1 98
IV.ASSB.HHZ. 2021-10-23T17:31:52.51 0.1 undecidable manual P 212 18.4704 125 0.08 98
IV.CESI.HHZ. 2021-10-23T17:31:52.76 0.1 undecidable manual P 153 22.1556 118 -0.17 96
IV.SNTG.HHZ. 2021-10-23T17:31:52.00 0.1 undecidable manual P 58 15.2736 131 -0.04 99
IV.ATCC.EHZ. 2021-10-23T17:31:51.66 0.1 undecidable manual P 271 11.3775 141 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.8 0.000035699999999999994 1.44 AML other m 2021-10-23T17:31:53.80
IV.FOSV.EHN. ML:1.0 0.00007965 0.12 AML other m 2021-10-23T17:31:54.50
IV.FOSV.EHE. ML:0.8 0.00004975 0.38 AML other m 2021-10-23T17:31:54.39
IV.ATCC.EHN. ML:1.3 0.00014450000000000002 0.38 AML other m 2021-10-23T17:31:54.62
IV.ATCC.EHE. ML:1.3 0.00014749999999999998 0.38 AML other m 2021-10-23T17:31:54.81
IV.ASSB.HHN. ML:1.4 0.00015335 1.68 AML other m 2021-10-23T17:31:55.02
IV.MML1.EHN. ML:1.1 0.00008585 1.88 AML other m 2021-10-23T17:31:55.00
IV.ASSB.HHE. ML:1.6 0.0002325 0.34 AML other m 2021-10-23T17:31:56.01
IV.MML1.EHE. ML:1.2 0.00009575 1.42 AML other m 2021-10-23T17:31:56.11
IV.CESI.HHN. ML:0.7 0.00003175 1.54 AML other m 2021-10-23T17:31:58.08
IV.MURB.HHE. ML:1.3 0.00010515 1.68 AML other m 2021-10-23T17:31:58.15
IV.FDMO.HHN. ML:1.1 0.00005755 0.16 AML other m 2021-10-23T17:31:59.09
IV.FDMO.HHE. ML:1.1 0.0000599 1.4 AML other m 2021-10-23T17:31:59.04
IV.MURB.HHN. ML:1.1 0.00006725000000000001 0.26 AML other m 2021-10-23T17:31:59.14
IV.CSP1.EHE. ML:1.6 0.00014105 0.8 AML other m 2021-10-23T17:32:00.55
IV.CSP1.EHN. ML:1.6 0.0001295 0.42 AML other m 2021-10-23T17:32:00.57
IV.NRCA.HHE. ML:1.2 0.0000426 0.1 AML other m 2021-10-23T17:32:04.04
IV.NRCA.HHN. ML:1.1 0.00003655 0.68 AML other m 2021-10-23T17:32:04.63
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