Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 21-03-2021 and time 15:47:34 (UTC) in region 3 km NW Ussita (MC)

A magnitude ML 1.2 earthquake occured in region: 3 km NW Ussita (MC), on

  • 21-03-2021 15:47:34 (UTC)
  • 21-03-2021 16:47:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9670, 13.1200 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 3 444 444
Visso MC 5 1107 1551
Fiordimonte MC 8 202 1753
Fiastra MC 8 559 2312
Acquacanina MC 8 121 2433
Castelsantangelo sul Nera MC 9 281 2714
Bolognola MC 9 142 2856
Monte Cavallo MC 10 145 3001
Pieve Torina MC 10 1458 4459
Pievebovigliana MC 11 866 5325
Preci PG 12 724 6049
Muccia MC 14 915 6964
Sarnano MC 17 3264 10228
Sellano PG 18 1079 11307
Serravalle di Chienti MC 18 1070 12377
Montefortino FM 18 1178 13555
Montemonaco AP 19 604 14159
Camerino MC 19 6974 21133
Amandola FM 19 3629 24762
Norcia PG 20 4957 29719
Cessapalombo MC 20 512 30231

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
59 Km NW of Teramo (54892 inhabitants)
59 Km NE of Terni (111501 inhabitants)
61 Km E of Perugia (166134 inhabitants)
72 Km NW of L'Aquila (69753 inhabitants)
79 Km SW of Ancona (100861 inhabitants)
98 Km S of Fano (60888 inhabitants)
98 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
Bulletin
Rev1000 		ML 1.2 2021-03-21
15:47:34		 42.9673 13.1197 10 2021-07-12
16:55:05		 Bollettino Sismico Italiano INGV 88767971
Reviewed
Rev100 		ML 1.3 2021-03-21
15:47:34		 42.9638 13.118 9 2021-03-21
15:51:56		 Sala Sismica INGV-Roma 88349151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-21 15:47:34 ± 0.15
Latitude 42.9673 ± 0.0054
Longitude 13.1197 ± 0.0074
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88767971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 610
Semi-minor axis of confidence ellipse (meter) 389
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 354
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 91
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.05126
Epicentral distance of station farthest from the epicenter (degree) 0.24911
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 88767971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-04 15:24:23

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 88349151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-21 15:51:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHZ. 2021-03-21T15:47:44.83 0.3 undecidable manual S 85 27.6501 50 0.32 69
IV.GUMA.HHZ. 2021-03-21T15:47:42.66 0.3 undecidable manual S 59 20.4684 116 0.4 69
IV.MMO1.EHZ. 2021-03-21T15:47:41.26 0.3 undecidable manual S 114 18.4704 118 -0.38 69
IV.PF6.EHZ. 2021-03-21T15:47:41.66 0.3 undecidable manual S 18 19.869 116 -0.42 69
IV.CESI.HHZ. 2021-03-21T15:47:41.54 0.6 undecidable manual S 283 17.9709 119 0.04 50
IV.MF5.EHZ. 2021-03-21T15:47:40.71 0.3 undecidable manual P 85 27.6501 50 0.48 67
IV.NRCA.HHZ. 2021-03-21T15:47:40.30 0.6 undecidable manual S 182 14.874 124 -0.28 48
IV.CSP1.EHZ. 2021-03-21T15:47:40.85 0.3 undecidable manual S 27 15.4734 123 0.11 74
IV.MC2.EHZ. 2021-03-21T15:47:39.35 0.3 undecidable manual S 138 8.3805 140 0.47 69
IT.MTCL.HGZ. 2021-03-21T15:47:39.63 0.1 undecidable manual S 287 10.1787 134 0.32 95
IV.FEMA.HNZ. 2021-03-21T15:47:39.16 0.3 undecidable manual S 264 5.6943 150 0.82 61
IV.CSP1.EHZ. 2021-03-21T15:47:38.02 0.1 positive manual P 27 15.4734 123 -0.04 100
IV.GUMA.HHZ. 2021-03-21T15:47:38.89 0.1 undecidable manual P 59 20.4684 116 -0.04 99
IV.MMO1.EHZ. 2021-03-21T15:47:38.26 0.1 negative manual P 114 18.4704 118 -0.32 94
IV.PF6.EHZ. 2021-03-21T15:47:38.57 0.1 undecidable manual P 18 19.869 116 -0.26 95
IV.CESI.HHZ. 2021-03-21T15:47:38.46 0.6 undecidable manual P 283 17.9709 119 -0.03 50
IV.NRCA.HHZ. 2021-03-21T15:47:37.76 0.1 negative manual P 182 14.874 124 -0.2 97
IV.MC2.EHZ. 2021-03-21T15:47:37.18 0.3 undecidable manual P 138 8.3805 140 0.2 73
IV.FEMA.HNZ. 2021-03-21T15:47:36.25 0.1 undecidable manual P 264 5.6943 150 -0.42 94
IT.MTCL.HGZ. 2021-03-21T15:47:36.94 0.1 undecidable manual P 287 10.1787 134 -0.29 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MF5.EHE. ML:1.2 0.000075800595 1.9968 AML other m 2021-03-21T15:47:44.94
IV.NRCA.HNE. ML:1.5 0.00031723665 0.1536 AML other m 2021-03-21T15:47:40.44
IV.NRCA.HHE. ML:1.5 0.00030663105000000004 0.1536 AML other m 2021-03-21T15:47:40.44
IV.NRCA.HHN. ML:1.3 0.00018910445000000002 0.1664 AML other m 2021-03-21T15:47:40.46
IV.CESI.HNE. ML:1.1 0.000093025935 1.5392 AML other m 2021-03-21T15:47:41.09
IV.CSP1.EHN. ML:1.3 0.00018890725 0.128 AML other m 2021-03-21T15:47:41.10
IV.NRCA.HNN. ML:1.3 0.00018900525000000001 0.1024 AML other m 2021-03-21T15:47:41.42
IV.CSP1.EHE. ML:1.0 0.00009034877499999999 0.1536 AML other m 2021-03-21T15:47:41.51
IV.CESI.HHN. ML:1.1 0.00010725475499999999 0.1408 AML other m 2021-03-21T15:47:41.90
IV.CESI.HHE. ML:0.9 0.000068800375 0.1152 AML other m 2021-03-21T15:47:41.90
IV.CESI.HNN. ML:1.4 0.00018825829999999998 1.7312 AML other m 2021-03-21T15:47:42.89
IV.MF5.EHN. ML:1.1 0.00007226982499999999 0.2944 AML other m 2021-03-21T15:47:44.00
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