Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-10-2023 and time 23:20:26 (UTC) in region 1 km SW Norcia (PG)

A magnitude ML 1.4 earthquake occured in region: 1 km SW Norcia (PG), on

  • 04-10-2023 23:20:26 (UTC)
  • 05-10-2023 01:20:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7830, 13.0850 at 11 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 1 4957 4957
Cascia PG 9 3217 8174
Preci PG 11 724 8898
Castelsantangelo sul Nera MC 14 281 9179
Cerreto di Spoleto PG 14 1075 10254
Poggiodomo PG 15 117 10371
Accumoli RI 17 667 11038
Visso MC 17 1107 12145
Arquata del Tronto AP 17 1178 13323
Sellano PG 18 1079 14402
Monteleone di Spoleto PG 18 599 15001
Vallo di Nera PG 18 364 15365
Ussita MC 19 444 15809
Cittareale RI 19 482 16291

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km SE of Foligno (57155 inhabitants)
43 Km NE of Terni (111501 inhabitants)
53 Km W of Teramo (54892 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
99 Km W of Pescara (121014 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 1.4 2023-10-04
23:20:26		 42.7833 13.0853 11 2023-10-04
23:26:20		 Sala Sismica INGV-Roma 121766241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-04 23:20:26 ± 0.04
Latitude 42.7833 ± 0.0018
Longitude 13.0853 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121766241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 273
Semi-minor axis of confidence ellipse (meter) 68
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 98
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
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 27
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33994
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 56
Type of magnitude ML
Reference to an origin 121766241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-04 23:26:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CING.HHZ. 2023-10-04T23:20:47.80 3.0 undecidable manual S -0.07 0
IV.MML1.EHZ. 2023-10-04T23:20:38.96 0.6 undecidable manual S 346 37.7289 50 -0.07 48
IV.CING.HHZ. 2023-10-04T23:20:38.41 3.0 positive manual P -0.09 0
IV.CSP1.EHZ. 2023-10-04T23:20:38.50 0.6 undecidable manual S 16 35.5422 50 0.06 48
IV.RM33.EHZ. 2023-10-04T23:20:37.39 0.6 undecidable manual S 161 32.2455 50 -0.16 48
IV.CESI.HHZ. 2023-10-04T23:20:36.58 0.6 undecidable manual S 329 28.6491 50 -0.01 49
IV.MNTT.EHZ. 2023-10-04T23:20:36.78 3.0 negative manual P 0.48 0
IV.FDMO.HHZ. 2023-10-04T23:20:36.40 0.6 undecidable manual S 0 28.0497 50 -0.05 49
IV.ATCC.EHZ. 2023-10-04T23:20:36.84 3.0 undecidable manual P -0.07 0
IV.TERO.HNZ. 2023-10-04T23:20:35.64 3.0 undecidable manual P 0.08 0
IV.MMO1.EHZ. 2023-10-04T23:20:35.27 0.6 undecidable manual S 57 23.4543 50 0.06 49
IV.ASSB.HHZ. 2023-10-04T23:20:34.92 3.0 positive manual P 0.07 0
IV.LNSS.HHZ. 2023-10-04T23:20:34.26 0.6 undecidable manual S 190 20.3685 50 -0.13 49
IV.CSP1.EHZ. 2023-10-04T23:20:33.33 0.1 positive manual P 16 35.5422 50 -0.06 97
IV.GAVE.EHZ. 2023-10-04T23:20:33.95 0.6 undecidable manual S 237 18.5703 50 0.05 50
IV.GUMA.HHZ. 2023-10-04T23:20:33.94 0.6 undecidable manual P 33 37.0296 50 0.32 46
IV.MML1.EHZ. 2023-10-04T23:20:33.69 1.0 positive manual P 346 37.7289 50 -0.04 24
IV.MOMA.HHZ. 2023-10-04T23:20:33.81 3.0 undecidable manual P -0.61 0
IV.RM33.EHZ. 2023-10-04T23:20:32.84 1.0 positive manual P 161 32.2455 50 -0.03 24
IV.SMA1.EHZ. 2023-10-04T23:20:32.16 0.6 undecidable manual P 130 26.5512 50 0.16 48
IV.CESI.HHZ. 2023-10-04T23:20:32.30 0.6 undecidable manual P 329 28.6491 50 -0.03 49
IV.FDMO.HHZ. 2023-10-04T23:20:32.16 0.6 positive manual P 0 28.0497 50 -0.08 49
IV.LNSS.HHZ. 2023-10-04T23:20:31.08 0.1 positive manual P 190 20.3685 50 0.03 100
IV.MMO1.EHZ. 2023-10-04T23:20:31.44 0.3 positive manual P 57 23.4543 50 -0.09 74
IV.NRCA.HHZ. 2023-10-04T23:20:30.73 0.6 undecidable manual S 23 5.994 151 -0.14 50
IV.GAVE.EHZ. 2023-10-04T23:20:30.88 0.3 positive manual P 237 18.5703 50 0.11 74
IV.NRCA.HHZ. 2023-10-04T23:20:29.10 0.3 undecidable manual P 23 5.994 151 0.08 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.7 0.0008255000000000001 0.1 AML other m 2023-10-04T23:20:30.88
IV.NRCA.HNN. ML:1.7 0.0008225 0.08 AML other m 2023-10-04T23:20:30.84
IV.NRCA.HHE. ML:2.1 0.001705 0.16 AML other m 2023-10-04T23:20:30.85
IV.NRCA.HNE. ML:2.0 0.001535 0.14 AML other m 2023-10-04T23:20:30.85
IV.GAVE.EHN. ML:1.7 0.00041049999999999995 0.14 AML other m 2023-10-04T23:20:34.43
IV.GAVE.EHE. ML:1.7 0.00040149999999999995 0.16 AML other m 2023-10-04T23:20:34.67
IV.LNSS.HHE. ML:1.6 0.0002515 0.12 AML other m 2023-10-04T23:20:34.59
IV.LNSS.HHN. ML:1.4 0.00018871955 0.192 AML other m 2023-10-04T23:20:34.64
IV.MMO1.EHN. ML:1.2 0.000110129645 0.0512 AML other m 2023-10-04T23:20:35.48
IV.MMO1.EHE. ML:1.1 0.000070496165 0.0896 AML other m 2023-10-04T23:20:35.51
IV.FDMO.HHN. ML:1.4 0.00013197945 0.1024 AML other m 2023-10-04T23:20:36.93
IV.CESI.HHN. ML:1.3 0.00010647052 0.1152 AML other m 2023-10-04T23:20:37.18
IV.CESI.HHE. ML:1.0 0.000057058795 0.1024 AML other m 2023-10-04T23:20:37.02
IV.FDMO.HHE. ML:1.2 0.00007950000000000001 0.12 AML other m 2023-10-04T23:20:37.48
IV.RM33.EHN. ML:1.2 0.00007222951 0.1024 AML other m 2023-10-04T23:20:38.69
IV.RM33.EHE. ML:1.1 0.00005668069000000001 0.1152 AML other m 2023-10-04T23:20:38.70
IV.CSP1.EHE. ML:1.4 0.000096824615 0.1408 AML other m 2023-10-04T23:20:39.57
IV.MML1.EHN. ML:1.1 0.00004725 0.22 AML other m 2023-10-04T23:20:39.75
IV.CSP1.EHN. ML:1.4 0.00011145957 0.2304 AML other m 2023-10-04T23:20:40.63
IV.MML1.EHE. ML:1.2 0.0000543 0.68 AML other m 2023-10-04T23:20:40.58
IV.GUMA.HHN. ML:1.3 0.00007063395499999999 0.2176 AML other m 2023-10-04T23:20:40.98
IV.ASSB.HHE. ML:1.1 0.00003980763 0.1536 AML other m 2023-10-04T23:20:41.59
IV.TERO.HHN. ML:1.2 0.00004720479499999999 0.064 AML other m 2023-10-04T23:20:41.91
IV.MOMA.HHN. ML:1.5 0.00009510000000000001 0.14 AML other m 2023-10-04T23:20:42.15
IV.MOMA.HHE. ML:1.3 0.00006409999999999999 1.08 AML other m 2023-10-04T23:20:42.69
IV.ASSB.HHN. ML:1.0 0.00002998081 0.1152 AML other m 2023-10-04T23:20:44.08
IV.TERO.HHE. ML:1.0 0.000031074779999999995 0.064 AML other m 2023-10-04T23:20:42.91
IV.GUMA.HHE. ML:1.3 0.00007135 0.36 AML other m 2023-10-04T23:20:43.32
IV.ATCC.EHN. ML:1.2 0.000037289005 0.576 AML other m 2023-10-04T23:20:57.21
IV.ATCC.EHE. ML:1.3 0.000044200000000000004 0.32 AML other m 2023-10-04T23:20:56.75
IV.GAVE.HNE. ML:1.7 0.00041874435 0.1792 AML other m 2023-10-04T23:20:34.66
IV.GAVE.HNN. ML:1.2 0.00012613881 0.1408 AML other m 2023-10-04T23:20:34.42
IV.LNSS.HNE. ML:1.5 0.00022857465 0.128 AML other m 2023-10-04T23:20:34.59
IV.LNSS.HNN. ML:1.4 0.00019067055 0.1152 AML other m 2023-10-04T23:20:34.64
IV.MMO1.HNE. ML:3.0 0.005813551 0.7808 AML other m 2023-10-04T23:20:43.87
IV.MMO1.HNN. ML:2.9 0.004875576 0.6656 AML other m 2023-10-04T23:20:44.71
IV.CESI.HNE. ML:1.4 0.0001305029 0.512 AML other m 2023-10-04T23:20:43.14
IV.CESI.HNN. ML:1.3 0.000107149819 0.5376 AML other m 2023-10-04T23:20:48.01
IV.RM33.HNE. ML:1.5 0.0001340207 0.9216 AML other m 2023-10-04T23:20:49.16
IV.RM33.HNN. ML:1.3 0.00009602755 0.5504 AML other m 2023-10-04T23:20:44.19
IV.MML1.HNE. ML:1.6 0.00016612965 0.9728 AML other m 2023-10-04T23:20:49.86
IV.MML1.HNN. ML:1.4 0.00008392237999999999 0.8192 AML other m 2023-10-04T23:20:32.95
IV.MOMA.HNE. ML:1.5 0.00010732791 0.1664 AML other m 2023-10-04T23:20:42.16
IV.MOMA.HNN. ML:1.6 0.0001309638 1.1136 AML other m 2023-10-04T23:20:50.25
IV.GUMA.HNE. ML:1.6 0.0001394113 0.7552 AML other m 2023-10-04T23:20:43.97
IV.GUMA.HNN. ML:1.5 0.000122122725 0.4608 AML other m 2023-10-04T23:20:41.50
IV.TERO.HNE. ML:1.5 0.00008654887999999999 0.7168 AML other m 2023-10-04T23:20:55.36
IV.TERO.HNN. ML:1.5 0.0000898484 0.9216 AML other m 2023-10-04T23:20:52.89
IV.MNTT.EHE. ML:1.4 0.00006730864 0.6784 AML other m 2023-10-04T23:20:57.38
IV.MNTT.EHN. ML:1.5 0.00007808804749999999 0.9216 AML other m 2023-10-04T23:20:59.19
IV.ATCC.HNE. ML:1.8 0.000141364 0.7168 AML other m 2023-10-04T23:20:51.98
IV.ATCC.HNN. ML:1.9 0.00015775655 0.7936 AML other m 2023-10-04T23:20:57.79
IV.CING.HNE. ML:3.5 0.006324104999999999 1.0496 AML other m 2023-10-04T23:20:45.14
IV.CING.HNN. ML:3.5 0.0056557085 0.8704 AML other m 2023-10-04T23:20:41.16
IV.CING.HHE. ML:0.9 0.0000146551285 0.96 AML other m 2023-10-04T23:20:38.63
IV.CING.HHN. ML:0.9 0.00001411461 0.1792 AML other m 2023-10-04T23:20:49.71
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