Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 29-03-2021 and time 22:40:53 (Italy) in region 1 km NW Ussita (MC)

A magnitude ML 1.1 earthquake occured in region: 1 km NW Ussita (MC), on

  • 29-03-2021 20:40:53 (UTC)
  • 29-03-2021 22:40:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9570, 13.1320 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 1 444 444
Visso MC 5 1107 1551
Castelsantangelo sul Nera MC 7 281 1832
Bolognola MC 9 142 1974
Acquacanina MC 9 121 2095
Fiastra MC 9 559 2654
Fiordimonte MC 10 202 2856
Preci PG 11 724 3580
Monte Cavallo MC 11 145 3725
Pieve Torina MC 12 1458 5183
Pievebovigliana MC 12 866 6049
Muccia MC 16 915 6964
Sarnano MC 16 3264 10228
Montefortino FM 17 1178 11406
Montemonaco AP 17 604 12010
Sellano PG 18 1079 13089
Norcia PG 18 4957 18046
Amandola FM 19 3629 21675
Serravalle di Chienti MC 20 1070 22745
Cessapalombo MC 20 512 23257

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Foligno (57155 inhabitants)
57 Km NW of Teramo (54892 inhabitants)
59 Km NE of Terni (111501 inhabitants)
63 Km E of Perugia (166134 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
80 Km SW of Ancona (100861 inhabitants)
97 Km NW of Montesilvano (53738 inhabitants)
99 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 1.1 2021-03-29
20:40:53		 42.9567 13.1323 9 2021-03-29
20:49:51		 Sala Sismica INGV-Roma 88599251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-29 20:40:53 ± 0.05
Latitude 42.9567 ± 0.0027
Longitude 13.1323 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88599251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 277
Semi-minor axis of confidence ellipse (meter) 224
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 199
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
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) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.37322
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 88599251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-29 20:49:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2021-03-29T20:41:07.01 0.3 undecidable manual S 284 39.627 50 0.02 71
IV.EL6.EHZ. 2021-03-29T20:41:07.71 0.3 undecidable manual S 357 41.4252 50 0.23 68
IV.GAVE.EHZ. 2021-03-29T20:41:06.29 0.3 undecidable manual S 214 35.1426 50 0.48 65
IV.MML1.HNZ. 2021-03-29T20:41:01.49 0.3 undecidable manual S 323 21.7671 111 0.01 74
IV.PF6.EHZ. 2021-03-29T20:41:01.08 0.3 undecidable manual S 14 20.7681 112 -0.07 73
IV.GUMA.HHZ. 2021-03-29T20:41:01.53 0.3 undecidable manual S 54 20.2686 113 0.54 66
IV.EL6.EHZ. 2021-03-29T20:41:01.17 0.1 undecidable manual P 357 41.4252 50 -0.35 88
IV.CESI.HHZ. 2021-03-29T20:41:00.99 0.3 undecidable manual S 286 19.2696 114 0.31 69
IV.GAVE.EHZ. 2021-03-29T20:41:00.28 0.1 undecidable manual P 214 35.1426 50 -0.27 91
IV.ASSB.HHZ. 2021-03-29T20:41:00.94 0.1 undecidable manual P 284 39.627 50 -0.3 90
IV.NRCA.HNZ. 2021-03-29T20:40:59.16 0.3 undecidable manual S 186 13.7751 122 0.17 72
IV.CSP1.EHZ. 2021-03-29T20:40:59.79 0.3 undecidable manual S 21 16.0728 118 0.09 73
IV.MF5.EHZ. 2021-03-29T20:40:59.36 0.1 undecidable manual P 82 26.751 108 0.35 91
IV.MMO1.EHZ. 2021-03-29T20:40:59.74 0.3 undecidable manual S 112 17.0718 116 -0.24 71
IV.MML1.HNZ. 2021-03-29T20:40:58.00 0.1 undecidable manual P 323 21.7671 111 -0.06 97
IV.GUMA.HHZ. 2021-03-29T20:40:57.92 0.1 undecidable manual P 54 20.2686 113 0.15 96
IV.FDMO.HHZ. 2021-03-29T20:40:57.63 0.3 undecidable manual S 338 9.5793 131 -0.19 72
IV.MMO1.EHZ. 2021-03-29T20:40:57.04 0.1 undecidable manual P 112 17.0718 116 -0.15 96
IV.MC2.EHZ. 2021-03-29T20:40:57.00 0.3 undecidable manual S 138 6.7932 141 -0.15 73
IV.CESI.HHZ. 2021-03-29T20:40:57.72 0.1 undecidable manual P 286 19.2696 114 0.12 96
IV.PF6.EHZ. 2021-03-29T20:40:57.78 0.1 undecidable manual P 14 20.7681 112 -0.09 97
IV.CSP1.EHZ. 2021-03-29T20:40:56.90 0.1 undecidable manual P 21 16.0728 118 -0.13 97
IV.NRCA.HNZ. 2021-03-29T20:40:56.59 0.1 undecidable manual P 186 13.7751 122 -0.02 99
IT.MTCL.HGZ. 2021-03-29T20:40:56.25 0.1 undecidable manual P 291 11.5773 126 0 100
IV.FDMO.HHZ. 2021-03-29T20:40:55.79 0.1 undecidable manual P 338 9.5793 131 -0.16 97
IV.MC2.EHZ. 2021-03-29T20:40:55.43 0.1 undecidable manual P 138 6.7932 141 -0.13 98
IV.FEMA.HNZ. 2021-03-29T20:40:55.66 0.1 undecidable manual P 275 6.7932 141 0.11 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSP1.EHN. ML:1.3 0.00019600000000000002 1.4 AML other m 2021-03-29T20:41:00.78
IV.CESI.HHN. ML:1.3 0.0001475 0.64 AML other m 2021-03-29T20:41:01.76
IV.CESI.HHE. ML:1.0 0.00008575 1.66 AML other m 2021-03-29T20:41:01.96
IV.CSP1.EHE. ML:1.2 0.000161 0.32 AML other m 2021-03-29T20:41:03.82
IV.ASSB.HHN. ML:1.0 0.0000392 1.8 AML other m 2021-03-29T20:41:06.09
IV.ASSB.HHE. ML:0.9 0.000031 0.44 AML other m 2021-03-29T20:41:08.24
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