Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 12-05-2021 and time 02:31:50 (Italy) in region Norcia (PG)

A magnitude ML 1.2 earthquake occured in region: Norcia (PG), on

  • 12-05-2021 00:31:50 (UTC)
  • 12-05-2021 02:31:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7930, 13.0900 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
Norcia PG 0 4957 4957
Cascia PG 10 3217 8174
Preci PG 10 724 8898
Castelsantangelo sul Nera MC 13 281 9179
Cerreto di Spoleto PG 14 1075 10254
Visso MC 15 1107 11361
Poggiodomo PG 15 117 11478
Accumoli RI 17 667 12145
Sellano PG 17 1079 13224
Arquata del Tronto AP 17 1178 14402
Ussita MC 17 444 14846
Vallo di Nera PG 19 364 15210
Monteleone di Spoleto PG 19 599 15809

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SE of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km N of Tivoli (56533 inhabitants)
98 Km SW of Ancona (100861 inhabitants)
99 Km W of Pescara (121014 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 1.2 2021-05-12
00:31:50		 42.7932 13.0898 10 2021-05-12
00:37:03		 Sala Sismica INGV-Roma 90005531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-12 00:31:50 ± 0.06
Latitude 42.7932 ± 0.0036
Longitude 13.0898 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 90005531

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 430
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 280
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.04407
Epicentral distance of station farthest from the epicenter (degree) 0.41369
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 90005531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-12 00:37:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-05-12T00:32:05.57 0.6 undecidable manual S 114 45.9207 50 -0.13 47
IV.MF5.EHZ. 2021-05-12T00:32:04.31 0.6 undecidable manual S 54 37.0296 50 1 35
IV.RM33.EHZ. 2021-05-12T00:32:02.27 0.6 undecidable manual S 162 33.1446 50 0 49
IV.SMA1.EHZ. 2021-05-12T00:32:00.41 0.6 undecidable manual S 132 26.9508 50 -0.21 47
IV.CESI.HHZ. 2021-05-12T00:32:00.68 0.6 undecidable manual S 327 27.8499 50 -0.2 47
IV.FDMO.HHZ. 2021-05-12T00:32:00.14 0.6 undecidable manual S 360 26.9508 50 -0.49 45
IV.TERO.HHZ. 2021-05-12T00:31:59.15 0.3 undecidable manual P 114 45.9207 50 -0.22 69
IV.MTRA.EHZ. 2021-05-12T00:31:59.78 0.6 undecidable manual S 99 25.2525 111 -0.38 46
IV.T1299.HNZ. 2021-05-12T00:31:59.79 0.6 undecidable manual S 138 23.5542 113 0.18 48
IV.GAVE.EHZ. 2021-05-12T00:31:58.41 0.6 undecidable manual S 235 19.4694 117 0.09 49
IV.LNSS.HHZ. 2021-05-12T00:31:58.74 0.6 undecidable manual S 191 21.4674 115 -0.2 48
IV.MMO1.EHZ. 2021-05-12T00:31:58.94 0.3 undecidable manual S 58 22.5552 114 -0.35 70
IV.MF5.EHZ. 2021-05-12T00:31:58.55 0.3 undecidable manual P 54 37.0296 50 0.56 64
IV.MC2.EHZ. 2021-05-12T00:31:57.34 0.6 undecidable manual S 32 15.3735 123 0.26 48
IV.RM33.EHZ. 2021-05-12T00:31:57.23 0.1 undecidable manual P 162 33.1446 50 -0.16 95
IV.FDMO.HHZ. 2021-05-12T00:31:56.35 0.3 undecidable manual P 360 26.9508 50 -0.09 73
IV.T1299.HNZ. 2021-05-12T00:31:56.02 0.3 undecidable manual P 138 23.5542 113 0.17 72
IV.SMA1.EHZ. 2021-05-12T00:31:56.57 0.3 undecidable manual P 132 26.9508 50 0.13 72
IV.CESI.HHZ. 2021-05-12T00:31:56.52 0.1 undecidable manual P 327 27.8499 50 -0.06 98
IV.MTRA.EHZ. 2021-05-12T00:31:56.24 0.3 undecidable manual P 99 25.2525 111 0.07 73
IV.GAVE.EHZ. 2021-05-12T00:31:55.20 0.1 undecidable manual P 235 19.4694 117 0.09 98
IV.LNSS.HHZ. 2021-05-12T00:31:55.53 0.1 undecidable manual P 191 21.4674 115 0.06 99
IV.MMO1.EHZ. 2021-05-12T00:31:55.53 0.1 undecidable manual P 58 22.5552 114 -0.14 97
IV.MC2.EHZ. 2021-05-12T00:31:54.62 0.1 undecidable manual P 32 15.3735 123 0.22 96
IV.NRCA.HHZ. 2021-05-12T00:31:54.31 0.3 undecidable manual S 24 4.8951 154 -0.26 73
IV.NRCA.HHZ. 2021-05-12T00:31:53.08 0.1 undecidable manual P 24 4.8951 154 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.6 0.0006234999999999999 0.06 AML other m 2021-05-12T00:31:54.42
IV.NRCA.HNN. ML:1.5 0.0005415 0.08 AML other m 2021-05-12T00:31:54.42
IV.NRCA.HHE. ML:1.7 0.000812 0.18 AML other m 2021-05-12T00:31:54.53
IV.NRCA.HNE. ML:1.6 0.000776 0.14 AML other m 2021-05-12T00:31:54.53
IV.GAVE.EHN. ML:0.9 0.00005915 0.16 AML other m 2021-05-12T00:31:59.40
IV.GAVE.EHE. ML:1.0 0.00007214999999999999 0.58 AML other m 2021-05-12T00:32:00.41
IV.SMA1.EHE. ML:0.9 0.000046399999999999996 0.86 AML other m 2021-05-12T00:32:01.37
IV.SMA1.EHN. ML:0.9 0.000039699999999999996 0.68 AML other m 2021-05-12T00:32:04.15
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