Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-09-2021 and time 04:18:52 (UTC) in region 8 km W Gualdo Tadino (PG)

A magnitude ML 1.1 earthquake occured in region: 8 km W Gualdo Tadino (PG), on

  • 23-09-2021 04:18:52 (UTC)
  • 23-09-2021 06:18:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2160, 12.6850 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
Gualdo Tadino PG 8 15208 15208
Valfabbrica PG 9 3389 18597
Fossato di Vico PG 11 2840 21437
Sigillo PG 14 2404 23841
Nocera Umbra PG 15 5839 29680
Costacciaro PG 16 1216 30896
Assisi PG 17 28299 59195
Gubbio PG 18 32216 91411
Valtopina PG 18 1398 92809
Bastia Umbra PG 20 21874 114683

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Perugia (166134 inhabitants)
29 Km N of Foligno (57155 inhabitants)
71 Km E of Arezzo (99543 inhabitants)
73 Km N of Terni (111501 inhabitants)
75 Km SW of Fano (60888 inhabitants)
80 Km S of Pesaro (94582 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
95 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 1.1 2021-09-23
04:18:52		 43.2162 12.6848 8 2021-09-23
04:27:11		 Sala Sismica INGV-Roma 95768831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-23 04:18:52 ± 0.07
Latitude 43.2162 ± 0.0027
Longitude 12.6848 ± 0.0049
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95768831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 451
Semi-minor axis of confidence ellipse (meter) 243
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.32376
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 95768831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-23 04:27:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-09-23T04:19:05.54 0.1 undecidable manual S 69 35.9418 50 -0.12 93
IV.ATBU.EHN. 2021-09-23T04:19:04.19 0.6 undecidable manual S 339 30.8469 105 0.16 47
IV.ATVO.HHZ. 2021-09-23T04:19:03.07 0.3 undecidable manual S 309 29.0487 106 -0.37 67
IV.CESI.HHZ. 2021-09-23T04:19:03.42 0.1 undecidable manual S 143 29.4483 105 -0.14 94
IV.MML1.EHZ. 2021-09-23T04:19:02.41 0.1 undecidable manual S 116 25.8519 108 0.04 96
IV.ATSC.EHE. 2021-09-23T04:19:01.35 0.3 undecidable manual S 0 23.0547 109 -0.11 71
IV.ASSB.HHZ. 2021-09-23T04:19:00.31 0.1 undecidable manual S 186 19.3695 113 0.05 97
IV.EL6.EHZ. 2021-09-23T04:19:00.49 0.1 undecidable manual P 69 35.9418 50 0.19 92
IV.ATFO.HHZ. 2021-09-23T04:19:00.69 3.0 undecidable manual S 0
IV.ATBU.EHN. 2021-09-23T04:18:59.42 0.3 undecidable manual P 339 30.8469 105 0.06 71
IV.ATVO.HHZ. 2021-09-23T04:18:58.69 0.3 undecidable manual P 309 29.0487 106 -0.32 68
IV.ATFO.HHZ. 2021-09-23T04:18:58.06 3.0 undecidable manual P 0
IV.CESI.HHZ. 2021-09-23T04:18:58.93 0.3 undecidable manual P 143 29.4483 105 -0.15 70
IV.MML1.EHZ. 2021-09-23T04:18:58.75 0.3 undecidable manual P 116 25.8519 108 0.35 68
IV.MURB.HHZ. 2021-09-23T04:18:58.95 0.1 undecidable manual S 292 13.9749 120 0.38 92
IV.ASSB.HHZ. 2021-09-23T04:18:57.17 0.1 undecidable manual P 186 19.3695 113 0 98
IV.ATSC.EHE. 2021-09-23T04:18:57.87 0.1 undecidable manual P 0 23.0547 109 0 97
IV.MURB.HHZ. 2021-09-23T04:18:56.34 0.3 undecidable manual P 292 13.9749 120 0.14 72
IV.ATCC.EHZ. 2021-09-23T04:18:56.14 0.1 undecidable manual S 227 4.995 149 -0.14 98
IV.ATCC.EHZ. 2021-09-23T04:18:54.86 0.1 undecidable manual P 227 4.995 149 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHN. ML:1.2 0.0002985 0.16 AML other m 2021-09-23T04:18:56.43
IV.ATCC.EHE. ML:1.2 0.00026700000000000004 0.76 AML other m 2021-09-23T04:18:56.29
IV.MURB.HHE. ML:1.2 0.0001785 0.26 AML other m 2021-09-23T04:18:59.22
IV.MURB.HHN. ML:1.2 0.000168 0.14 AML other m 2021-09-23T04:18:59.58
IV.ASSB.HHN. ML:1.0 0.00007405000000000001 0.5 AML other m 2021-09-23T04:19:00.70
IV.ASSB.HHE. ML:0.9 0.00006165 0.2 AML other m 2021-09-23T04:19:00.61
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