Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 21-10-2021 and time 13:10:47 (Italy) in region 3 km SW Ussita (MC)

A magnitude ML 0.9 earthquake occured in region: 3 km SW Ussita (MC), on

  • 21-10-2021 11:10:47 (UTC)
  • 21-10-2021 13:10:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9260, 13.1200 at 9 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
Ussita MC 3 444 444
Visso MC 3 1107 1551
Castelsantangelo sul Nera MC 4 281 1832
Preci PG 8 724 2556
Bolognola MC 12 142 2698
Monte Cavallo MC 12 145 2843
Acquacanina MC 13 121 2964
Fiastra MC 13 559 3523
Fiordimonte MC 13 202 3725
Pieve Torina MC 14 1458 5183
Norcia PG 15 4957 10140
Pievebovigliana MC 16 866 11006
Sellano PG 16 1079 12085
Montemonaco AP 17 604 12689
Montefortino FM 18 1178 13867
Muccia MC 19 915 14782
Sarnano MC 19 3264 18046
Montegallo AP 20 523 18569

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
56 Km NE of Terni (111501 inhabitants)
56 Km NW of Teramo (54892 inhabitants)
63 Km E of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
96 Km W of Montesilvano (53738 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 0.9 2021-10-21
11:10:47		 42.9263 13.1205 9 2022-03-30
13:04:38		 Bollettino Sismico Italiano INGV 101217441
Reviewed
Rev100 		ML 0.9 2021-10-21
11:10:47		 42.9253 13.1063 2 2021-10-21
11:15:29		 Sala Sismica INGV-Roma 96841691
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-21 11:10:47 ± 0.07
Latitude 42.9263 ± 0.0027
Longitude 13.1205 ± 0.0037
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101217441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 283
Semi-minor axis of confidence ellipse (meter) 239
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 221
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
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) 0.05216
Epicentral distance of station farthest from the epicenter (degree) 0.28688
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96841691
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-21 11:15:29

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 101217441
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-21 11:46:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GAVE.EHZ. 2021-10-21T11:10:58.32 0.6 undecidable manual S 215 31.8459 50 -0.17 46
IV.MF5.EHZ. 2021-10-21T11:10:58.04 0.6 undecidable manual S 76 28.3494 108 0.58 42
IV.MML1.EHZ. 2021-10-21T11:10:55.91 0.6 undecidable manual S 330 24.0537 111 -0.12 48
IV.CESI.HHZ. 2021-10-21T11:10:54.73 0.3 undecidable manual S 297 19.5693 115 0.12 72
IV.CSP1.EHZ. 2021-10-21T11:10:54.40 0.3 undecidable manual S 20 19.5693 115 -0.22 70
IV.MF5.EHZ. 2021-10-21T11:10:53.19 0.3 undecidable manual P 76 28.3494 108 0.11 71
IV.GAVE.EHZ. 2021-10-21T11:10:53.53 0.1 undecidable manual P 215 31.8459 50 -0.15 93
IV.MMO1.EHN. 2021-10-21T11:10:53.56 0.6 undecidable manual S 100 17.0718 118 -0.26 47
IV.MML1.EHZ. 2021-10-21T11:10:52.62 0.3 undecidable manual P 330 24.0537 111 0.36 68
IT.MTCL.HGZ. 2021-10-21T11:10:52.25 0.6 undecidable manual S 307 12.3765 126 -0.2 48
IV.FDMO.HHZ. 2021-10-21T11:10:52.17 0.6 undecidable manual S 348 12.4764 126 -0.32 47
IV.CSP1.EHZ. 2021-10-21T11:10:51.28 0.3 undecidable manual P 20 19.5693 115 -0.16 71
IV.CESI.HHZ. 2021-10-21T11:10:51.48 0.1 undecidable manual P 297 19.5693 115 0.04 97
IV.NRCA.HHZ. 2021-10-21T11:10:51.79 0.6 undecidable manual S 183 10.2786 132 -0.1 49
IV.MMO1.EHN. 2021-10-21T11:10:50.92 0.3 undecidable manual P 100 17.0718 118 -0.06 73
IV.NRCA.HHZ. 2021-10-21T11:10:50.00 0.1 positive manual P 183 10.2786 132 0.13 97
IT.MTCL.HGZ. 2021-10-21T11:10:50.30 0.6 undecidable manual P 307 12.3765 126 0.11 49
IV.FDMO.HHZ. 2021-10-21T11:10:50.25 0.3 undecidable manual P 348 12.4764 126 0.03 74
IV.FEMA.HNE. 2021-10-21T11:10:50.99 0.6 undecidable manual S 305 6.993 143 -0.11 49
IV.MC2.EHZ. 2021-10-21T11:10:50.68 0.6 undecidable manual S 106 5.7942 148 -0.19 48
IV.FEMA.HNE. 2021-10-21T11:10:49.73 0.3 undecidable manual P 305 6.993 143 0.32 71
IV.MC2.EHZ. 2021-10-21T11:10:49.31 0.1 undecidable manual P 106 5.7942 148 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.4 0.00030783 1.9232 AML other m 2021-10-21T11:10:51.99
IV.FDMO.HHN. ML:0.8 0.00006394529 0.2432 AML other m 2021-10-21T11:10:52.50
IV.FDMO.HHE. ML:0.7 0.000060557069999999994 0.2624 AML other m 2021-10-21T11:10:52.37
IV.NRCA.HHN. ML:1.1 0.00017226265000000002 0.096 AML other m 2021-10-21T11:10:52.00
IV.CESI.HHN. ML:1.2 0.00011519035 1.8592 AML other m 2021-10-21T11:10:54.99
IV.CESI.HHE. ML:0.8 0.000043727465 0.16 AML other m 2021-10-21T11:10:55.41
IV.MML1.EHN. ML:0.6 0.000023138515 1.3248 AML other m 2021-10-21T11:10:56.03
IV.MML1.EHE. ML:0.4 0.000014342893099999999 0.1984 AML other m 2021-10-21T11:10:56.65
IV.GAVE.EHN. ML:1.2 0.00006578176999999999 1.84 AML other m 2021-10-21T11:10:58.07
IV.GAVE.EHE. ML:1.1 0.000058540649999999997 0.16 AML other m 2021-10-21T11:10:59.63
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