Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 16-04-2021 and time 21:53:02 (UTC) in region 2 km S Ussita (MC)

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

  • 16-04-2021 21:53:02 (UTC)
  • 16-04-2021 23:53:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9260, 13.1460 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
Castelsantangelo sul Nera MC 4 281 725
Visso MC 5 1107 1832
Preci PG 10 724 2556
Bolognola MC 10 142 2698
Acquacanina MC 12 121 2819
Fiastra MC 12 559 3378
Fiordimonte MC 13 202 3580
Monte Cavallo MC 14 145 3725
Montemonaco AP 15 604 4329
Pieve Torina MC 15 1458 5787
Norcia PG 15 4957 10744
Pievebovigliana MC 16 866 11610
Montefortino FM 16 1178 12788
Sarnano MC 18 3264 16052
Montegallo AP 18 523 16575
Amandola FM 18 3629 20204
Sellano PG 18 1079 21283
Muccia MC 19 915 22198

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
54 Km NW of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
65 Km E of Perugia (166134 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
94 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 2021-04-16
21:53:02		 42.9262 13.1457 8 2021-04-16
22:01:35		 Sala Sismica INGV-Roma 89159961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 21:53:02 ± 0.08
Latitude 42.9262 ± 0.0009
Longitude 13.1457 ± 0.0025
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 89159961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 150
Semi-minor axis of confidence ellipse (meter) 40
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 67
Circular confidence region, given by single value of horizontal uncertainty (meter) 150.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.05
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.19335
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 89159961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 22:01:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2021-04-16T21:53:10.05 3.0 undecidable manual P 0
IV.CSP1.EHZ. 2021-04-16T21:53:10.12 0.6 undecidable manual S 15 18.9699 113 0.02 66
IV.CESI.HHZ. 2021-04-16T21:53:10.99 0.6 undecidable manual S 294 21.4674 111 0.11 65
IV.TERO.HNZ. 2021-04-16T21:53:09.57 3.0 undecidable manual P -0.04 0
IV.FDMO.HHZ. 2021-04-16T21:53:08.27 0.6 undecidable manual S 339 13.1757 122 -0.01 67
IV.MMO1.EHZ. 2021-04-16T21:53:08.91 0.6 undecidable manual S 101 14.9739 119 0.05 66
IV.CESI.HHZ. 2021-04-16T21:53:07.46 0.6 negative manual P 294 21.4674 111 -0.06 65
IV.NRCA.HNZ. 2021-04-16T21:53:07.48 0.6 undecidable manual S 194 10.5783 128 -0.08 66
IV.CSP1.EHZ. 2021-04-16T21:53:07.03 0.3 undecidable manual P 15 18.9699 113 -0.03 99
IV.MMO1.EHZ. 2021-04-16T21:53:06.35 0.6 positive manual P 101 14.9739 119 0 67
IV.NRCA.HNZ. 2021-04-16T21:53:05.66 0.3 undecidable manual P 194 10.5783 128 0.06 100
IV.FDMO.HHZ. 2021-04-16T21:53:05.97 0.6 negative manual P 339 13.1757 122 -0.05 66
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.2 0.0000214 0.24 AML other m 2021-04-16T21:53:08.45
IV.FDMO.HHN. ML:0.3 0.000026606754999999998 0.1792 AML other m 2021-04-16T21:53:08.42
IV.CSP1.EHN. ML:0.0 0.000033912849999999995 1.1904 AML other m 2021-04-16T21:53:11.58
IV.CESI.HHE. ML:0.3 0.000014047719999999999 1.536 AML other m 2021-04-16T21:53:12.95
IV.CESI.HHN. ML:0.4 0.00001898296 0.128 AML other m 2021-04-16T21:53:11.13
IV.CESI.HNE. ML:1.3 0.0001285998 0.6656 AML other m 2021-04-16T21:53:14.37
IV.CESI.HNN. ML:1.3 0.00014829175 0.9344 AML other m 2021-04-16T21:53:14.89
IV.CSP1.EHE. ML:0.0 0.00004698017999999999 3.2384 AML other m 2021-04-16T21:53:10.94
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