Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 28-10-2021 and time 00:30:56 (Italy) in region 2 km W Ussita (MC)

A magnitude ML 1.3 earthquake occured in region: 2 km W Ussita (MC), on

  • 27-10-2021 22:30:56 (UTC)
  • 28-10-2021 00:30:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9510, 13.1170 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
Ussita MC 2 444 444
Visso MC 3 1107 1551
Castelsantangelo sul Nera MC 7 281 1832
Fiordimonte MC 10 202 2034
Acquacanina MC 10 121 2155
Fiastra MC 10 559 2714
Preci PG 10 724 3438
Bolognola MC 10 142 3580
Monte Cavallo MC 11 145 3725
Pieve Torina MC 12 1458 5183
Pievebovigliana MC 13 866 6049
Muccia MC 16 915 6964
Sellano PG 17 1079 8043
Norcia PG 18 4957 13000
Sarnano MC 18 3264 16264
Montemonaco AP 18 604 16868
Montefortino FM 18 1178 18046
Serravalle di Chienti MC 19 1070 19116
Amandola FM 20 3629 22745

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
58 Km NE of Terni (111501 inhabitants)
58 Km NW of Teramo (54892 inhabitants)
62 Km E of Perugia (166134 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
97 Km NW of Montesilvano (53738 inhabitants)
100 Km S 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 1.3 2021-10-27
22:30:56		 42.9507 13.1172 11 2021-10-27
22:35:38		 Sala Sismica INGV-Roma 97029331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-27 22:30:56 ± 0.05
Latitude 42.9507 ± 0.0027
Longitude 13.1172 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97029331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 266
Semi-minor axis of confidence ellipse (meter) 195
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
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) 0.08813
Epicentral distance of station farthest from the epicenter (degree) 0.63402
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 19
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 97029331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-27 22:35:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FRON.EHZ. 2021-10-27T22:31:08.14 1.0 undecidable manual P 333 70.374 50 -0.22 22
IV.TERO.HHZ. 2021-10-27T22:31:05.71 0.3 undecidable manual P 132 53.8017 50 -0.08 70
IV.ARRO.EHZ. 2021-10-27T22:31:05.28 1.0 positive manual P 215 50.2164 50 0.05 24
IV.MML1.EHZ. 2021-10-27T22:31:04.07 0.1 undecidable manual S 327 21.5673 116 -0.28 94
IV.ATCC.EHZ. 2021-10-27T22:31:04.62 0.6 positive manual P 304 46.62 50 -0.07 47
IV.GUMA.HHZ. 2021-10-27T22:31:04.42 0.1 undecidable manual S 55 21.6672 116 0.06 99
IV.MNTT.EHZ. 2021-10-27T22:31:04.36 0.1 negative manual P 72 40.7259 50 0.58 84
IV.ASSB.HHZ. 2021-10-27T22:31:03.26 0.6 positive manual P 285 38.5281 50 -0.19 47
IV.SMA1.EHZ. 2021-10-27T22:31:03.39 0.6 positive manual P 153 39.7269 50 -0.23 46
IV.LNSS.HHZ. 2021-10-27T22:31:03.39 0.3 negative manual P 189 39.0276 50 -0.14 71
IV.CESI.HHZ. 2021-10-27T22:31:03.48 0.1 undecidable manual S 289 18.2706 120 0.14 98
IV.EL6.EHZ. 2021-10-27T22:31:03.79 1.0 negative manual P 358 42.0246 50 -0.19 23
IV.MF5.EHZ. 2021-10-27T22:31:02.13 1.0 positive manual P 81 28.1496 50 0.29 23
IV.CSP1.EHZ. 2021-10-27T22:31:02.96 0.1 undecidable manual S 24 17.1717 121 -0.05 99
IV.SNTG.HHZ. 2021-10-27T22:31:02.97 1.0 positive manual P 337 36.6411 50 -0.19 23
IV.MMO1.EHZ. 2021-10-27T22:31:02.95 0.1 undecidable manual S 108 17.9709 120 -0.29 95
IV.GAVE.EHZ. 2021-10-27T22:31:02.70 0.6 negative manual P 212 33.9438 50 -0.03 49
IV.FDMO.HHZ. 2021-10-27T22:31:01.12 0.1 undecidable manual S 346 9.7791 137 0.1 100
IV.NRCA.HNZ. 2021-10-27T22:31:01.88 0.1 undecidable manual S 181 12.9759 129 0.06 100
IV.CESI.HHZ. 2021-10-27T22:31:00.34 0.1 negative manual P 289 18.2706 120 0.1 98
IV.MML1.EHZ. 2021-10-27T22:31:00.69 0.6 undecidable manual P 327 21.5673 116 -0.14 49
IV.CSP1.EHZ. 2021-10-27T22:31:00.00 0.1 positive manual P 24 17.1717 121 -0.06 99
IV.MMO1.EHZ. 2021-10-27T22:31:00.02 1.0 undecidable manual P 108 17.9709 120 -0.16 24
IV.GUMA.HHZ. 2021-10-27T22:31:00.85 0.1 positive manual P 55 21.6672 116 0.02 99
IV.FDMO.HHZ. 2021-10-27T22:30:59.03 0.1 positive manual P 346 9.7791 137 0.13 99
IV.NRCA.HNZ. 2021-10-27T22:30:59.47 0.1 undecidable manual P 181 12.9759 129 0.1 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:1.5 0.0003855 0.18 AML other m 2021-10-27T22:31:01.36
IV.FDMO.HHE. ML:1.2 0.00018099999999999998 0.44 AML other m 2021-10-27T22:31:01.42
IV.CSP1.EHE. ML:1.4 0.00023150000000000002 0.86 AML other m 2021-10-27T22:31:03.56
IV.CESI.HHE. ML:1.2 0.00011599999999999999 0.46 AML other m 2021-10-27T22:31:03.85
IV.CSP1.EHN. ML:1.6 0.000313 0.12 AML other m 2021-10-27T22:31:03.79
IV.CESI.HHN. ML:1.2 0.00013350000000000002 0.42 AML other m 2021-10-27T22:31:04.35
IV.MML1.EHE. ML:1.2 0.00011269999999999999 0.32 AML other m 2021-10-27T22:31:04.67
IV.GUMA.HHE. ML:1.6 0.00027150000000000004 0.24 AML other m 2021-10-27T22:31:04.78
IV.MML1.EHN. ML:1.3 0.00014150000000000002 0.96 AML other m 2021-10-27T22:31:04.37
IV.GUMA.HHN. ML:1.4 0.000182 0.5 AML other m 2021-10-27T22:31:06.32
IV.GAVE.EHE. ML:1.4 0.0001125 0.2 AML other m 2021-10-27T22:31:08.34
IV.ASSB.HHN. ML:1.1 0.0000431 0.42 AML other m 2021-10-27T22:31:09.15
IV.SNTG.HHE. ML:1.0 0.0000352 0.44 AML other m 2021-10-27T22:31:09.71
IV.SNTG.HHN. ML:1.0 0.000038900000000000004 0.64 AML other m 2021-10-27T22:31:10.13
IV.GAVE.EHN. ML:1.3 0.00008525 0.18 AML other m 2021-10-27T22:31:10.25
IV.ASSB.HHE. ML:1.0 0.000034099999999999995 1.4 AML other m 2021-10-27T22:31:10.12
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