Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 03-10-2021 and time 02:54:26 (UTC) in region 4 km SE Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 4 km SE Norcia (PG), on

  • 03-10-2021 02:54:26 (UTC)
  • 03-10-2021 04:54:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7730, 13.1300 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 4 4957 4957
Cascia PG 11 3217 8174
Accumoli RI 13 667 8841
Arquata del Tronto AP 14 1178 10019
Castelsantangelo sul Nera MC 14 281 10300
Preci PG 14 724 11024
Poggiodomo PG 17 117 11141
Cittareale RI 17 482 11623
Visso MC 18 1107 12730
Cerreto di Spoleto PG 18 1075 13805
Montegallo AP 18 523 14328
Ussita MC 19 444 14772
Monteleone di Spoleto PG 20 599 15371

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SE of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km E of Viterbo (67173 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
95 Km W of Pescara (121014 inhabitants)
97 Km W of Chieti (51815 inhabitants)
99 Km SW of Ancona (100861 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 2021-10-03
02:54:26		 42.7727 13.1298 10 2021-10-03
03:21:58		 Sala Sismica INGV-Roma 96158391
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-03 02:54:26 ± 0.05
Latitude 42.7727 ± 0.0027
Longitude 13.1298 ± 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 96158391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 356
Semi-minor axis of confidence ellipse (meter) 180
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 112
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33005
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 12
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 96158391
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-03 03:21:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESX.HHZ. 2021-10-03T02:54:42.00 3.0 undecidable manual S -0.49 0
IV.ARRO.EHZ. 2021-10-03T02:54:39.00 0.6 undecidable manual S 234 36.6411 50 0.01 49
IV.MF5.EHZ. 2021-10-03T02:54:39.61 0.6 undecidable manual S 48 35.9418 50 0.82 39
IV.PP3.EHZ. 2021-10-03T02:54:38.89 3.0 negative manual P -1.76 0
IV.CESI.HHZ. 2021-10-03T02:54:37.62 0.6 undecidable manual S 325 31.6461 50 -0.02 49
IV.RM33.EHZ. 2021-10-03T02:54:37.34 0.6 undecidable manual S 167 30.0477 50 0.11 49
IV.MNTT.EHZ. 2021-10-03T02:54:36.43 3.0 undecidable manual P 0.38 0
IV.OFFI.HHZ. 2021-10-03T02:54:36.19 3.0 positive manual P 0.25 0
IV.FDMO.HHZ. 2021-10-03T02:54:36.45 0.6 undecidable manual S 353 29.4483 50 -0.62 43
IV.TERO.HHZ. 2021-10-03T02:54:34.38 3.0 undecidable manual P -0.49 0
IV.GAVE.EHZ. 2021-10-03T02:54:34.77 0.6 undecidable manual S 245 21.1677 115 0.14 49
IV.MTRA.EHZ. 2021-10-03T02:54:34.62 0.6 undecidable manual S 95 21.7671 115 -0.2 48
IV.SMA1.EHZ. 2021-10-03T02:54:34.87 0.6 undecidable manual S 133 22.9548 113 -0.34 47
IV.MMO1.EHZ. 2021-10-03T02:54:34.51 0.3 undecidable manual S 49 21.3675 115 -0.17 73
IV.LNSS.HHZ. 2021-10-03T02:54:34.28 0.6 undecidable manual S 201 20.1687 116 -0.04 50
IV.CSP1.EHZ. 2021-10-03T02:54:33.38 3.0 positive manual P -0.24 0
IV.MC2.EHZ. 2021-10-03T02:54:33.23 0.6 undecidable manual S 17 16.1727 122 0.14 50
IV.ARRO.EHZ. 2021-10-03T02:54:33.56 0.6 negative manual P 234 36.6411 50 -0.15 48
IV.MF5.EHZ. 2021-10-03T02:54:33.90 0.6 undecidable manual P 48 35.9418 50 0.3 46
IV.FDMO.HHZ. 2021-10-03T02:54:32.35 0.6 undecidable manual P 353 29.4483 50 -0.26 47
IV.CESI.HHZ. 2021-10-03T02:54:32.70 0.6 negative manual P 325 31.6461 50 -0.23 47
IV.RM33.EHZ. 2021-10-03T02:54:32.78 0.6 undecidable manual P 167 30.0477 50 0.08 49
IV.SMA1.EHZ. 2021-10-03T02:54:31.52 0.6 negative manual P 133 22.9548 113 -0.01 50
IV.MMO1.EHZ. 2021-10-03T02:54:31.08 1.0 negative manual P 49 21.3675 115 -0.14 25
IV.LNSS.HHZ. 2021-10-03T02:54:31.09 0.1 undecidable manual P 201 20.1687 116 0.07 100
IV.GAVE.EHZ. 2021-10-03T02:54:31.17 0.3 positive manual P 245 21.1677 115 -0.03 75
IV.MTRA.EHZ. 2021-10-03T02:54:31.32 0.6 undecidable manual P 95 21.7671 115 0.01 50
IV.NRCA.HNZ. 2021-10-03T02:54:30.73 0.3 undecidable manual S 349 6.8931 145 0.02 77
IV.MC2.EHZ. 2021-10-03T02:54:30.46 0.6 undecidable manual P 17 16.1727 122 0.15 49
IV.NRCA.HNZ. 2021-10-03T02:54:29.11 0.1 negative manual P 349 6.8931 145 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:1.0 0.00007730000000000001 0.2 AML other m 2021-10-03T02:54:34.52
IV.LNSS.HHE. ML:1.0 0.00007395000000000001 0.66 AML other m 2021-10-03T02:54:34.48
IV.GAVE.EHE. ML:1.4 0.000168 0.18 AML other m 2021-10-03T02:54:35.15
IV.GAVE.EHN. ML:1.4 0.0001525 0.62 AML other m 2021-10-03T02:54:35.08
IV.MTRA.EHE. ML:1.2 0.0001079 0.88 AML other m 2021-10-03T02:54:35.87
IV.SMA1.EHE. ML:0.9 0.0000526 1.42 AML other m 2021-10-03T02:54:36.84
IV.FDMO.HHN. ML:0.8 0.0000301 0.9 AML other m 2021-10-03T02:54:37.76
IV.MTRA.EHN. ML:1.1 0.0000808 0.42 AML other m 2021-10-03T02:54:37.67
IV.CESI.HHN. ML:0.9 0.00004055 0.34 AML other m 2021-10-03T02:54:37.67
IV.RM33.EHN. ML:0.7 0.0000264 0.9 AML other m 2021-10-03T02:54:38.18
IV.FDMO.HHE. ML:0.7 0.000025050000000000002 0.24 AML other m 2021-10-03T02:54:38.07
IV.SMA1.EHN. ML:0.9 0.00004955 0.38 AML other m 2021-10-03T02:54:38.59
IV.RM33.EHE. ML:0.6 0.000022150000000000003 0.48 AML other m 2021-10-03T02:54:38.89
IV.ARRO.EHE. ML:0.8 0.000027249999999999998 0.72 AML other m 2021-10-03T02:54:38.99
IV.CESI.HHE. ML:0.6 0.000022 0.68 AML other m 2021-10-03T02:54:39.01
IV.ARRO.EHN. ML:0.9 0.0000316 0.96 AML other m 2021-10-03T02:54:40.41
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