Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 18-10-2021 and time 18:27:06 (Italy) in region 2 km SW Ussita (MC)

A magnitude ML 0.6 earthquake occured in region: 2 km SW Ussita (MC), on

  • 18-10-2021 16:27:06 (UTC)
  • 18-10-2021 18:27:06 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9370, 13.1230 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
Ussita MC 2 444 444
Visso MC 3 1107 1551
Castelsantangelo sul Nera MC 5 281 1832
Preci PG 9 724 2556
Bolognola MC 11 142 2698
Acquacanina MC 11 121 2819
Fiastra MC 11 559 3378
Fiordimonte MC 12 202 3580
Monte Cavallo MC 12 145 3725
Pieve Torina MC 13 1458 5183
Pievebovigliana MC 14 866 6049
Norcia PG 16 4957 11006
Sellano PG 17 1079 12085
Montemonaco AP 17 604 12689
Muccia MC 17 915 13604
Montefortino FM 18 1178 14782
Sarnano MC 18 3264 18046
Amandola FM 20 3629 21675

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
57 Km NW of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
63 Km E of Perugia (166134 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
82 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
Reviewed
Rev100 		ML 0.6 2021-10-18
16:27:06		 42.9373 13.1228 8 2021-10-18
17:41:25		 Sala Sismica INGV-Roma 96732991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-18 16:27:06 ± 0.15
Latitude 42.9373 ± 0.0027
Longitude 13.1228 ± 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 96732991

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 345
Semi-minor axis of confidence ellipse (meter) 214
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.20774
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96732991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-18 17:41:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MFNL.HHZ. 2021-10-18T16:28:56.67 3.0 undecidable manual Sn -5.11 0
IV.ZEN8.EHZ. 2021-10-18T16:28:55.62 3.0 undecidable manual Sg 20.33 0
IV.ORI.HHZ. 2021-10-18T16:28:37.69 3.0 undecidable manual Sg 0.62 0
IV.CRND.HNZ. 2021-10-18T16:28:30.93 3.0 undecidable manual Sn -2.17 0
IV.VOBA.EHZ. 2021-10-18T16:28:30.39 3.0 undecidable manual Sn -6.8 0
IX.PGN3.HHZ.02 2021-10-18T16:28:18.12 3.0 undecidable manual Sg -1.36 0
GU.GSCL.HHZ. 2021-10-18T16:28:08.49 3.0 undecidable manual Sn -1.76 0
IV.TDS.HHZ. 2021-10-18T16:28:06.29 3.0 undecidable manual Pg 9.19 0
IV.SELL.HHZ. 2021-10-18T16:28:05.88 3.0 positive manual Pg -0.28 0
IV.PZUN.HHZ. 2021-10-18T16:28:05.46 3.0 undecidable manual Sn -9.99 0
IX.SCL3.EHZ.02 2021-10-18T16:28:03.55 3.0 undecidable manual Sn -9.95 0
IV.BRSN.HNZ. 2021-10-18T16:28:03.94 3.0 undecidable manual Sg 8.04 0
IX.SCL3.EHZ.02 2021-10-18T16:27:45.70 3.0 negative manual Pg 4.77 0
IV.PE3.EHZ. 2021-10-18T16:27:41.71 3.0 undecidable manual Sg 1.53 0
IX.PGN3.HHZ.02 2021-10-18T16:27:40.43 3.0 undecidable manual Pn -3.86 0
IV.COR1.EHZ. 2021-10-18T16:27:36.18 3.0 undecidable manual Sn -2.03 0
IV.CRTC.HHZ. 2021-10-18T16:27:34.66 3.0 undecidable manual Sn -6.75 0
IV.FIR.HHZ. 2021-10-18T16:27:32.35 3.0 undecidable manual Pg 3.55 0
IV.FOSV.EHZ. 2021-10-18T16:27:30.90 3.0 undecidable manual Sg 1.04 0
IV.CRTC.HHZ. 2021-10-18T16:27:26.48 3.0 negative manual Pg 3.58 0
IV.CSNT.HHZ. 2021-10-18T16:27:25.37 3.0 undecidable manual Pn -0.23 0
IV.CESX.HHZ. 2021-10-18T16:27:18.21 3.0 undecidable manual Sg 8.31 0
IV.VIVA.HHZ. 2021-10-18T16:27:18.70 3.0 undecidable manual Sg -4.89 0
IV.MML1.EHZ. 2021-10-18T16:27:14.78 0.6 undecidable manual S 328 23.0547 109 -0.12 48
IV.CSP1.EHZ. 2021-10-18T16:27:13.43 0.3 undecidable manual S 21 18.3705 113 0.05 74
IV.CESI.HHZ. 2021-10-18T16:27:13.88 0.3 undecidable manual S 293 19.2696 112 0.23 71
IV.NRCA.HHZ. 2021-10-18T16:27:11.05 0.6 undecidable manual S 183 11.4774 124 -0.23 48
IV.MML1.EHZ. 2021-10-18T16:27:11.21 0.6 positive manual P 328 23.0547 109 -0.11 48
IV.FDMO.HHZ. 2021-10-18T16:27:11.00 0.6 undecidable manual S 345 11.3775 125 -0.24 48
IV.ARRO.EHZ. 2021-10-18T16:27:11.25 3.0 undecidable manual Sn 4.09 0
IV.CESI.HHZ. 2021-10-18T16:27:10.61 0.1 undecidable manual P 293 19.2696 112 0 99
IV.CSP1.EHZ. 2021-10-18T16:27:10.42 1.0 positive manual P 21 18.3705 113 -0.03 25
IV.VIVA.HHZ. 2021-10-18T16:27:10.58 3.0 positive manual P -2.31 0
IV.OFFI.HHZ. 2021-10-18T16:27:09.53 3.0 undecidable manual Pn -5.82 0
IV.NRCA.HHZ. 2021-10-18T16:27:09.22 0.1 negative manual P 183 11.4774 124 -0.01 100
IV.FDMO.HHZ. 2021-10-18T16:27:09.26 1.0 undecidable manual P 345 11.3775 125 0.05 25
IV.MC2.EHZ. 2021-10-18T16:27:09.98 0.6 undecidable manual S 118 6.0939 142 0.1 50
IV.MC2.EHZ. 2021-10-18T16:27:08.56 0.3 negative manual P 118 6.0939 142 0.13 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.8 0.00008094999999999999 1.1 AML other m 2021-10-18T16:27:11.65
IV.NRCA.HHE. ML:0.8 0.00007685 1.12 AML other m 2021-10-18T16:27:11.29
IV.FDMO.HHN. ML:0.4 0.00002765 0.8 AML other m 2021-10-18T16:27:11.52
IV.FDMO.HHE. ML:0.3 0.00002565 0.28 AML other m 2021-10-18T16:27:11.76
IV.CESI.HHN. ML:0.0 0.00004605 1.9 AML other m 2021-10-18T16:27:13.97
IV.CESI.HHE. ML:0.0 0.0000223 0.16 AML other m 2021-10-18T16:27:14.35
IV.CSP1.EHE. ML:1.0 0.000084373665 0.32 AML other m 2021-10-18T16:27:14.18
IV.CSP1.EHN. ML:1.0 0.00007650234999999999 0.384 AML other m 2021-10-18T16:27:15.05
IV.MML1.EHE. ML:0.2 0.000010994753500000001 0.1792 AML other m 2021-10-18T16:27:17.37
IV.MML1.EHN. ML:0.2 0.0000113309915 0.192 AML other m 2021-10-18T16:27:17.25
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