Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 18-05-2021 and time 12:03:10 (Italy) in region 2 km SW Ussita (MC)

A magnitude ML 0.9 earthquake occured in region: 2 km SW Ussita (MC), on

  • 18-05-2021 10:03:10 (UTC)
  • 18-05-2021 12:03:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9320, 13.1300 at 12 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 12 121 2819
Fiastra MC 12 559 3378
Fiordimonte MC 12 202 3580
Monte Cavallo MC 13 145 3725
Pieve Torina MC 14 1458 5183
Pievebovigliana MC 15 866 6049
Norcia PG 16 4957 11006
Montemonaco AP 17 604 11610
Sellano PG 17 1079 12689
Montefortino FM 17 1178 13867
Muccia MC 18 915 14782
Sarnano MC 18 3264 18046
Amandola FM 19 3629 21675
Montegallo AP 19 523 22198

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Foligno (57155 inhabitants)
56 Km NW of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
63 Km E of Perugia (166134 inhabitants)
68 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
95 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 0.9 2021-05-18
10:03:10		 42.9325 13.1295 12 2021-05-18
10:07:20		 Sala Sismica INGV-Roma 90223871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-18 10:03:10 ± 0.1
Latitude 42.9325 ± 0.0036
Longitude 13.1295 ± 0.0061
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 90223871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 517
Semi-minor axis of confidence ellipse (meter) 99
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 63
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 0.17986
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 90223871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-18 10:07:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-05-18T10:03:18.04 0.3 undecidable manual S 19 18.6702 99 -0.08 74
IV.CESI.HHZ. 2021-05-18T10:03:18.61 0.3 undecidable manual S 294 19.9689 97 0.17 73
IV.MMO1.EHZ. 2021-05-18T10:03:17.25 0.3 undecidable manual S 103 16.4724 103 -0.27 73
IV.FDMO.HHZ. 2021-05-18T10:03:16.19 0.3 undecidable manual S 343 12.0768 117 -0.22 73
IT.MTCL.HGZ. 2021-05-18T10:03:16.35 0.1 undecidable manual S 303 12.5763 115 -0.19 96
IV.MC2.EHZ. 2021-05-18T10:03:15.29 0.1 undecidable manual S 116 5.3946 149 0.18 97
IV.NRCA.HHZ. 2021-05-18T10:03:15.80 0.3 undecidable manual S 186 11.0778 121 -0.38 69
IV.CSP1.EHZ. 2021-05-18T10:03:15.00 0.3 positive manual P 19 18.6702 99 0.04 73
IV.FEMA.HNZ. 2021-05-18T10:03:15.42 0.3 undecidable manual S 297 7.2927 139 0.01 76
IV.CESI.HHZ. 2021-05-18T10:03:15.25 0.1 positive manual P 294 19.9689 97 0.1 97
IV.MMO1.EHZ. 2021-05-18T10:03:14.54 0.1 undecidable manual P 103 16.4724 103 -0.08 100
IT.MTCL.HGZ. 2021-05-18T10:03:14.07 0.3 undecidable manual P 303 12.5763 115 0.02 75
IV.MC2.EHZ. 2021-05-18T10:03:13.40 0.1 undecidable manual P 116 5.3946 149 0.17 98
IV.NRCA.HHZ. 2021-05-18T10:03:13.89 0.1 positive manual P 186 11.0778 121 0.05 100
IV.FDMO.HHZ. 2021-05-18T10:03:13.97 0.3 undecidable manual P 343 12.0768 117 -0.01 75
IV.FEMA.HNZ. 2021-05-18T10:03:13.52 0.1 undecidable manual P 297 7.2927 139 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.3 0.0002215 0.1 AML other m 2021-05-18T10:03:16.06
IV.NRCA.HHE. ML:1.3 0.00022899999999999998 0.16 AML other m 2021-05-18T10:03:16.12
IV.FDMO.HHE. ML:0.7 0.00005574999999999999 0.8 AML other m 2021-05-18T10:03:16.34
IV.FDMO.HHN. ML:0.6 0.00004375 0.38 AML other m 2021-05-18T10:03:16.71
IV.CESI.HHN. ML:0.9 0.0000616 0.26 AML other m 2021-05-18T10:03:18.92
IV.CESI.HHE. ML:0.8 0.00004815 1.6 AML other m 2021-05-18T10:03:19.91
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