Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 22-09-2021 and time 23:16:18 (UTC) in region 1 km NW Spello (PG)

A magnitude ML 0.7 earthquake occured in region: 1 km NW Spello (PG), on

  • 22-09-2021 23:16:18 (UTC)
  • 23-09-2021 01:16:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.0020, 12.6610 at 10 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
Spello PG 1 8645 8645
Foligno PG 6 57155 65800
Cannara PG 6 4305 70105
Bevagna PG 9 5081 75186
Assisi PG 9 28299 103485
Valtopina PG 10 1398 104883
Bastia Umbra PG 12 21874 126757
Montefalco PG 12 5679 132436
Gualdo Cattaneo PG 13 6155 138591
Bettona PG 14 4367 142958
Trevi PG 16 8469 151427
Nocera Umbra PG 16 5839 157266
Valfabbrica PG 18 3389 160655
Torgiano PG 19 6725 167380
Deruta PG 20 9669 177049
Castel Ritaldi PG 20 3278 180327
Giano dell'Umbria PG 20 3846 184173

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NW of Foligno (57155 inhabitants)
25 Km E of Perugia (166134 inhabitants)
49 Km N of Terni (111501 inhabitants)
79 Km NE of Viterbo (67173 inhabitants)
82 Km SE of Arezzo (99543 inhabitants)
93 Km W of Teramo (54892 inhabitants)
94 Km NW of L'Aquila (69753 inhabitants)
98 Km SW of Ancona (100861 inhabitants)
98 Km SW of Fano (60888 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 0.7 2021-09-22
23:16:18		 43.002 12.6613 10 2021-09-22
23:23:51		 Sala Sismica INGV-Roma 95759111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-22 23:16:18 ± 0.14
Latitude 43.0020 ± 0.0063
Longitude 12.6613 ± 0.0086
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95759111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 851
Semi-minor axis of confidence ellipse (meter) 429
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 218
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31296
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 5
Type of magnitude ML
Reference to an origin 95759111
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-22 23:23:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-09-22T23:16:31.26 3.0 undecidable manual S 0
IV.FDMO.HHZ. 2021-09-22T23:16:30.70 0.6 undecidable manual S 84 34.743 50 -0.17 46
IV.MML1.EHZ. 2021-09-22T23:16:29.05 0.6 undecidable manual S 64 28.0497 50 -0.03 48
IV.MURB.HHZ. 2021-09-22T23:16:27.09 3.0 undecidable manual P 0
IV.CESI.HHZ. 2021-09-22T23:16:26.50 0.3 undecidable manual S 89 19.7691 116 0.05 73
IV.ATCC.EHZ. 2021-09-22T23:16:26.73 0.3 undecidable manual S 355 20.3685 115 0.07 72
IV.FDMO.HHZ. 2021-09-22T23:16:25.70 0.1 undecidable manual P 84 34.743 50 -0.08 94
IV.MML1.EHZ. 2021-09-22T23:16:24.68 1.0 positive manual P 64 28.0497 50 -0.07 24
IV.ATCC.EHZ. 2021-09-22T23:16:23.52 0.3 undecidable manual P 355 20.3685 115 0.17 71
IV.MOMA.HHZ. 2021-09-22T23:16:23.92 3.0 undecidable manual P -0.24 0
IV.CESI.HHZ. 2021-09-22T23:16:23.39 0.1 undecidable manual P 89 19.7691 116 0.16 94
IV.ASSB.HHZ. 2021-09-22T23:16:22.16 0.3 undecidable manual S 357 4.4955 155 -0.38 69
IV.ASSB.HHZ. 2021-09-22T23:16:21.04 0.1 undecidable manual P 357 4.4955 155 0.07 99
IT.FOPC.HGE. 2021-09-22T23:16:21.01 0.1 undecidable manual P 137 4.8951 153 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASSB.HHN. ML:0.9 0.000136 0.06 AML other m 2021-09-22T23:16:22.44
IV.ASSB.HHE. ML:0.9 0.000131 0.28 AML other m 2021-09-22T23:16:22.52
IV.CESI.HHN. ML:0.1 0.0000110073235 1.1008 AML other m 2021-09-22T23:16:23.78
IV.ATCC.EHE. ML:0.6 0.000029456175000000003 0.384 AML other m 2021-09-22T23:16:27.02
IV.MOMA.HHN. ML:0.6 0.000026813770000000002 1.5488 AML other m 2021-09-22T23:16:27.69
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