Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 02-02-2021 and time 18:39:34 (Italy) in region 2 km SE Ussita (MC)

A magnitude ML 1.1 earthquake occured in region: 2 km SE Ussita (MC), on

  • 02-02-2021 17:39:34 (UTC)
  • 02-02-2021 18:39:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9270, 13.1550 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
Castelsantangelo sul Nera MC 4 281 725
Visso MC 5 1107 1832
Bolognola MC 10 142 1974
Preci PG 11 724 2698
Acquacanina MC 12 121 2819
Fiastra MC 12 559 3378
Fiordimonte MC 13 202 3580
Montemonaco AP 14 604 4184
Monte Cavallo MC 15 145 4329
Montefortino FM 15 1178 5507
Pieve Torina MC 16 1458 6965
Norcia PG 16 4957 11922
Pievebovigliana MC 16 866 12788
Sarnano MC 17 3264 16052
Montegallo AP 17 523 16575
Amandola FM 18 3629 20204
Sellano PG 19 1079 21283
Muccia MC 20 915 22198

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
54 Km NW of Teramo (54892 inhabitants)
58 Km NE of Terni (111501 inhabitants)
65 Km E of Perugia (166134 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
82 Km SW of Ancona (100861 inhabitants)
93 Km NW 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 1.1 2021-02-02
17:39:34		 42.9273 13.1553 10 2021-02-02
17:58:54		 Sala Sismica INGV-Roma 86789151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-02 17:39:34 ± 0.09
Latitude 42.9273 ± 0.0045
Longitude 13.1553 ± 0.0049
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86789151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 461
Semi-minor axis of confidence ellipse (meter) 262
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 8
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38131
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 86789151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-02 17:58:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SRES.HHZ. 2021-02-02T17:40:00.22 3.0 undecidable manual Sg -0.2 0
IV.ASSB.HHZ. 2021-02-02T17:39:48.40 0.3 undecidable manual S 288 42.3243 50 0.08 71
IV.MF5.EHZ. 2021-02-02T17:39:44.23 0.3 undecidable manual S 75 25.5522 110 0.51 67
IV.ASSB.HHZ. 2021-02-02T17:39:42.16 0.1 undecidable manual P 288 42.3243 50 -0.21 92
IV.GUMA.HHZ. 2021-02-02T17:39:42.27 0.3 undecidable manual S 44 20.9679 115 0.05 74
IV.CESI.HHZ. 2021-02-02T17:39:42.76 0.3 undecidable manual S 293 22.0668 113 0.17 72
IV.ARRO.EHZ. 2021-02-02T17:39:41.61 3.0 undecidable manual P 0
IV.CESI.HHZ. 2021-02-02T17:39:39.10 0.1 undecidable manual P 293 22.0668 113 0.04 99
IV.MMO1.EHZ. 2021-02-02T17:39:39.75 0.3 undecidable manual S 103 14.2746 124 -0.45 69
IV.MF5.EHZ. 2021-02-02T17:39:39.69 0.1 undecidable manual P 75 25.5522 110 -0.02 99
IV.FDMO.HHZ. 2021-02-02T17:39:39.74 0.3 undecidable manual S 335 13.2756 126 -0.19 73
IV.NRCA.HHZ. 2021-02-02T17:39:39.28 0.3 undecidable manual S 198 10.9779 131 0 76
IV.GUMA.HHZ. 2021-02-02T17:39:38.84 0.1 undecidable manual P 44 20.9679 115 -0.01 100
IV.FDMO.HHZ. 2021-02-02T17:39:37.45 0.1 undecidable manual P 335 13.2756 126 -0.07 100
IV.NRCA.HHZ. 2021-02-02T17:39:37.32 0.1 undecidable manual P 198 10.9779 131 0.17 98
IV.MMO1.EHZ. 2021-02-02T17:39:37.52 1.0 undecidable manual P 103 14.2746 124 -0.16 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.00020400000000000003 0.14 AML other m 2021-02-02T17:39:39.47
IV.FDMO.HHN. ML:1.0 0.0001032 0.18 AML other m 2021-02-02T17:39:40.10
IV.FDMO.HHE. ML:0.8 0.00006481204 0.2048 AML other m 2021-02-02T17:39:40.04
IV.NRCA.HHE. ML:1.1 0.00016862015 0.1664 AML other m 2021-02-02T17:39:39.48
IV.CESI.HHE. ML:0.8 0.000039072404999999996 0.1664 AML other m 2021-02-02T17:39:44.08
IV.CESI.HHN. ML:1.1 0.00009095 0.14 AML other m 2021-02-02T17:39:43.00
IV.NRCA.HNE. ML:1.1 0.00015056734999999998 0.1536 AML other m 2021-02-02T17:39:40.22
IV.NRCA.HNN. ML:1.2 0.0001988621 0.1536 AML other m 2021-02-02T17:39:39.46
IV.GUMA.HHE. ML:1.1 0.000096971975 0.2176 AML other m 2021-02-02T17:39:45.22
IV.GUMA.HHN. ML:0.9 0.00006163944 0.2432 AML other m 2021-02-02T17:39:42.43
IV.GUMA.HNE. ML:1.2 0.00010899575000000001 0.3456 AML other m 2021-02-02T17:39:42.60
IV.GUMA.HNN. ML:2.2 0.0009996764499999998 0.7808 AML other m 2021-02-02T17:39:49.06
IV.CESI.HNE. ML:1.2 0.00012131805000000001 0.5504 AML other m 2021-02-02T17:39:44.86
IV.CESI.HNN. ML:1.3 0.0001335787 0.6144 AML other m 2021-02-02T17:39:50.14
IV.MF5.EHE. ML:1.0 0.000056147120000000005 0.1664 AML other m 2021-02-02T17:39:44.35
IV.MF5.EHN. ML:0.8 0.00003766204000000001 0.1792 AML other m 2021-02-02T17:39:44.36
IV.ASSB.HHE. ML:0.8 0.00002097201 0.1664 AML other m 2021-02-02T17:39:48.55
IV.ASSB.HHN. ML:0.9 0.000022882391249999997 0.1024 AML other m 2021-02-02T17:39:48.63
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