Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 26-04-2023 and time 11:34:35 (Italy) in region 6 km E Norcia (PG)

A magnitude ML 1.6 earthquake occured in region: 6 km E Norcia (PG), on

  • 26-04-2023 09:34:35 (UTC)
  • 26-04-2023 11:34:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8100, 13.1600 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.

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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 6 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Arquata del Tronto AP 12 1178 6416
Preci PG 13 724 7140
Accumoli RI 15 667 7807
Visso MC 15 1107 8914
Montegallo AP 15 523 9437
Ussita MC 15 444 9881
Cascia PG 16 3217 13098
Montemonaco AP 17 604 13702
Cerreto di Spoleto PG 20 1075 14777

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Foligno (57155 inhabitants)
48 Km W of Teramo (54892 inhabitants)
50 Km NE of Terni (111501 inhabitants)
55 Km NW of L'Aquila (69753 inhabitants)
71 Km E of Perugia (166134 inhabitants)
87 Km W of Montesilvano (53738 inhabitants)
94 Km W of Pescara (121014 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km NW of Chieti (51815 inhabitants)
99 Km NE of Tivoli (56533 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 1.6 2023-04-26
09:34:35		 42.8097 13.1597 10 2024-03-01
17:18:07		 Bollettino Sismico Italiano INGV 117221341
Reviewed
Rev100 		ML 1.7 2023-04-26
09:34:35		 42.8092 13.1613 10 2023-04-26
09:44:48		 Sala Sismica INGV-Roma 116765551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-26 09:34:35 ± 0.04
Latitude 42.8097 ± 0.0018
Longitude 13.1597 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117221341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 249
Semi-minor axis of confidence ellipse (meter) 153
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 64
Number of associated phases, regardless of their use for origin computation 59
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.52071
Number of stations at which the event was observed 37
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 30
Type of magnitude ML
Reference to an origin 116765551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-26 09:44:48

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 45
Type of magnitude ML
Reference to an origin 117221341
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-10 16:14:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
SI.ROSI.HHZ. 2023-04-26T09:35:55.60 3.0 undecidable manual Sn -2.47 0
IV.SALB.HHZ. 2023-04-26T09:35:43.65 3.0 undecidable manual Pg 16.98 0
IV.BRMO.HNZ. 2023-04-26T09:35:37.26 3.0 undecidable manual Sn -9.06 0
IV.SPS2.HHZ. 2023-04-26T09:35:23.61 3.0 undecidable manual Pn -8.09 0
IV.IVPL.HHZ. 2023-04-26T09:35:19.50 3.0 undecidable manual Pn -9.99 0
IV.CADC.HNZ. 2023-04-26T09:35:17.88 3.0 undecidable manual Sn -4.07 0
IV.MRLC.HHZ. 2023-04-26T09:35:16.53 3.0 undecidable manual Pg 4.12 0
IV.MCRV.HHZ. 2023-04-26T09:35:14.45 3.0 negative manual Pg 5.06 0
IV.BRMO.HNZ. 2023-04-26T09:35:13.56 3.0 undecidable manual Pg 8.91 0
RF.GEPF.HHZ. 2023-04-26T09:35:12.44 3.0 positive manual Pg 4.7 0
MN.BNI.HHZ. 2023-04-26T09:35:11.54 3.0 positive manual Pg 6.9 0
IV.FAGN.HHZ. 2023-04-26T09:35:07.93 3.0 undecidable manual Sn -4.8 0
IV.RCAV.EHZ. 2023-04-26T09:34:59.57 3.0 undecidable manual Sn -6.66 0
IV.PE3.EHZ. 2023-04-26T09:34:58.05 3.0 undecidable manual Sn 1.57 0
IV.EL6.EHZ. 2023-04-26T09:34:54.40 0.3 undecidable manual S 355 57.7977 50 0.57 61
IV.SNTG.HHZ. 2023-04-26T09:34:52.70 0.3 undecidable manual S 340 52.503 50 0.3 66
IV.ASSB.HHN. 2023-04-26T09:34:51.20 0.3 undecidable manual S 303 48.2184 50 -0.06 70
OX.MARN.HHZ. 2023-04-26T09:34:50.42 3.0 undecidable manual Pn -3.03 0
IV.TERO.HHZ. 2023-04-26T09:34:49.20 0.1 undecidable manual S 120 41.7249 50 -0.32 89
IV.MML1.EHZ. 2023-04-26T09:34:48.20 0.1 undecidable manual S 336 37.0296 50 -0.06 95
IV.MF5.EHZ. 2023-04-26T09:34:47.30 0.1 undecidable manual S 51 31.3464 50 0.54 86
IV.CAMP.HHZ. 2023-04-26T09:34:47.60 0.6 undecidable manual S 146 36.5412 50 -0.54 42
IV.GUMA.HHZ. 2023-04-26T09:34:47.00 0.1 undecidable manual S 27 31.4463 50 0.21 93
IV.RM33.EHZ. 2023-04-26T09:34:47.40 0.3 undecidable manual S 172 33.6441 50 0.03 72
IV.CSP1.EHZ. 2023-04-26T09:34:46.40 0.3 undecidable manual S 7 31.5462 50 -0.4 67
IV.EL6.EHZ. 2023-04-26T09:34:46.12 0.1 undecidable manual P 355 57.7977 50 0 92
IV.CESI.HHE. 2023-04-26T09:34:46.20 0.1 undecidable manual S 316 29.9478 50 -0.19 93
IV.GAVE.EHN. 2023-04-26T09:34:45.00 0.1 undecidable manual S 239 25.2525 111 0.04 97
IV.FDMO.HHZ. 2023-04-26T09:34:45.00 0.3 undecidable manual S 347 25.8519 110 -0.16 71
IV.SNTG.HHZ. 2023-04-26T09:34:45.22 0.1 undecidable manual P 340 52.503 50 -0.08 92
IT.MTCL.HGZ. 2023-04-26T09:34:44.50 0.3 undecidable manual S 328 24.2535 112 -0.14 72
IV.LNSS.HHZ. 2023-04-26T09:34:44.90 0.3 undecidable manual S 203 24.9528 111 0.04 73
IV.SMA1.EHZ. 2023-04-26T09:34:44.90 0.3 undecidable manual S 144 24.4533 111 0.18 71
IV.ASSB.HHN. 2023-04-26T09:34:44.56 0.1 undecidable manual P 303 48.2184 50 -0.08 93
IV.TERO.HHZ. 2023-04-26T09:34:43.45 0.1 undecidable manual P 120 41.7249 50 -0.19 92
IV.FEMA.HNE. 2023-04-26T09:34:43.10 0.3 undecidable manual S 332 19.1697 117 0.09 73
IV.MTRA.EHZ. 2023-04-26T09:34:43.20 0.3 undecidable manual S 107 20.1687 115 -0.14 72
IV.CAMP.HHZ. 2023-04-26T09:34:42.82 1.0 undecidable manual P 146 36.5412 50 -0.02 24
IV.MMO1.EHZ. 2023-04-26T09:34:42.00 0.1 undecidable manual S 54 16.872 120 -0.31 93
IV.GUMA.HHZ. 2023-04-26T09:34:42.21 0.1 negative manual P 27 31.4463 50 0.15 94
IV.MF5.EHZ. 2023-04-26T09:34:42.32 0.3 undecidable manual P 51 31.3464 50 0.28 69
IV.RM33.EHZ. 2023-04-26T09:34:42.36 0.3 undecidable manual P 172 33.6441 50 -0.03 72
IV.MML1.EHZ. 2023-04-26T09:34:42.82 0.1 positive manual P 336 37.0296 50 -0.09 94
IV.LNSS.HHZ. 2023-04-26T09:34:41.12 0.1 undecidable manual P 203 24.9528 111 0.18 94
IV.SMA1.EHZ. 2023-04-26T09:34:41.28 0.6 undecidable manual P 144 24.4533 111 0.42 45
IV.CSP1.EHZ. 2023-04-26T09:34:41.92 0.1 undecidable manual P 7 31.5462 50 -0.14 94
IV.GAVE.EHN. 2023-04-26T09:34:41.10 0.1 undecidable manual P 239 25.2525 111 0.1 96
IV.FDMO.HHZ. 2023-04-26T09:34:41.00 0.3 undecidable manual P 347 25.8519 110 -0.11 72
IV.CESI.HHE. 2023-04-26T09:34:41.73 0.1 undecidable manual P 316 29.9478 50 -0.1 95
IV.MTRA.EHZ. 2023-04-26T09:34:40.11 0.1 undecidable manual P 107 20.1687 115 0.05 98
IT.MTCL.HGZ. 2023-04-26T09:34:40.76 0.3 undecidable manual P 328 24.2535 112 -0.05 73
IV.BRSN.HNZ. 2023-04-26T09:34:40.62 3.0 negative manual Pg 1.54 0
IV.FEMA.HNE. 2023-04-26T09:34:39.86 1.0 undecidable manual P 332 19.1697 117 -0.02 25
IV.MMO1.EHZ. 2023-04-26T09:34:39.51 0.3 positive manual P 54 16.872 120 0.04 74
IV.NRCA.HHZ. 2023-04-26T09:34:39.20 0.1 undecidable manual S 306 4.5954 155 -0.07 100
IV.ARVD.HHZ. 2023-04-26T09:34:38.32 3.0 undecidable manual Pn -1.18 0
IV.NRCA.HHZ. 2023-04-26T09:34:37.94 0.1 negative manual P 306 4.5954 155 0.23 97
IV.RCAV.EHZ. 2023-04-26T09:34:37.85 3.0 positive manual P -4.28 0
IV.RIBO.EHZ.01 2023-04-26T09:34:12.58 3.0 undecidable manual P -6.49 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:0.0 0.00173 0.1 AML other m 2023-04-26T09:34:40.18
IV.NRCA.HHE. ML:0.0 0.002095 1.36 AML other m 2023-04-26T09:34:40.30
IV.MMO1.EHN. ML:0.0 0.00046550000000000004 0.66 AML other m 2023-04-26T09:34:42.38
IV.MMO1.EHE. ML:0.0 0.000439 1.78 AML other m 2023-04-26T09:34:43.98
IV.MTRA.EHN. ML:0.0 0.00048699999999999997 0.82 AML other m 2023-04-26T09:34:43.79
IV.MTRA.EHE. ML:0.0 0.0006585000000000001 1.38 AML other m 2023-04-26T09:34:43.86
IV.LNSS.HHE. ML:0.0 0.000614 0.2 AML other m 2023-04-26T09:34:45.33
IV.FDMO.HHN. ML:0.0 0.0001045 0.2 AML other m 2023-04-26T09:34:45.70
IV.LNSS.HHN. ML:0.0 0.0005920000000000001 1.32 AML other m 2023-04-26T09:34:45.92
IV.FDMO.HHE. ML:0.0 0.0000774 0.24 AML other m 2023-04-26T09:34:46.24
IV.CSP1.EHE. ML:0.0 0.0002775 1.06 AML other m 2023-04-26T09:34:46.29
IV.MF5.EHE. ML:0.0 0.0002104 0.26 AML other m 2023-04-26T09:34:47.81
IV.GUMA.HHN. ML:0.0 0.00030199999999999997 0.94 AML other m 2023-04-26T09:34:47.89
IV.GUMA.HNN. ML:0.0 0.000326 1.24 AML other m 2023-04-26T09:34:48.04
IV.MF5.EHN. ML:0.0 0.00017649999999999998 0.62 AML other m 2023-04-26T09:34:48.25
IV.CSP1.EHN. ML:0.0 0.000248 0.5 AML other m 2023-04-26T09:34:48.28
IV.SMA1.EHN. ML:0.0 0.00009436001 0.1984 AML other m 2023-04-26T09:34:45.93
IV.MML1.EHE. ML:0.0 0.00008515000000000001 0.8 AML other m 2023-04-26T09:34:48.93
IV.SMA1.EHE. ML:0.0 0.000110147 3.0208 AML other m 2023-04-26T09:34:46.66
IV.MML1.EHN. ML:0.0 0.0000897 0.32 AML other m 2023-04-26T09:34:49.12
IV.TERO.HHN. ML:0.0 0.00009865 0.5 AML other m 2023-04-26T09:34:49.66
IV.GUMA.HHE. ML:0.0 0.000329 1.26 AML other m 2023-04-26T09:34:49.26
IV.GUMA.HNE. ML:0.0 0.000386 1.34 AML other m 2023-04-26T09:34:49.27
IV.TERO.HHE. ML:0.0 0.0001083 0.98 AML other m 2023-04-26T09:34:50.82
IV.CAMP.HHN. ML:0.0 0.0000493 0.84 AML other m 2023-04-26T09:34:53.36
IV.CAMP.HHE. ML:0.0 0.00003370594 3.2768 AML other m 2023-04-26T09:34:49.62
IV.MMO1.HNE. ML:2.8 0.005688045500000001 1.6384 AML other m 2023-04-26T09:34:41.49
IV.MTRA.HNE. ML:1.9 0.00058179685 0.192 AML other m 2023-04-26T09:34:44.17
IV.MTRA.HNN. ML:1.8 0.00047483985000000003 0.3072 AML other m 2023-04-26T09:34:43.94
IV.LNSS.HNE. ML:1.9 0.00053087985 0.192 AML other m 2023-04-26T09:34:45.33
IV.LNSS.HNN. ML:1.9 0.0005392657 0.1728 AML other m 2023-04-26T09:34:46.00
IV.RM33.EHE. ML:1.1 0.000048605645000000004 0.096 AML other m 2023-04-26T09:34:48.94
IV.RM33.HNE. ML:1.6 0.00015990455000000002 0.384 AML other m 2023-04-26T09:34:47.80
IV.RM33.HNN. ML:1.5 0.00013504725000000001 2.4448 AML other m 2023-04-26T09:34:49.31
IV.RM33.EHN. ML:1.1 0.000053923054999999996 0.096 AML other m 2023-04-26T09:34:48.09
IV.MML1.HNE. ML:1.3 0.00008109975 0.1408 AML other m 2023-04-26T09:34:48.92
IV.MML1.HNN. ML:1.5 0.00012526475 1.8304 AML other m 2023-04-26T09:34:51.81
IV.TERO.HNE. ML:1.6 0.00014098696500000003 0.1408 AML other m 2023-04-26T09:34:49.88
IV.TERO.HNN. ML:1.7 0.0001731897 3.3088 AML other m 2023-04-26T09:34:48.60
IV.SNTG.HNE. ML:1.8 0.000153191 3.1296 AML other m 2023-04-26T09:34:55.96
IV.SNTG.HHE. ML:0.9 0.000021256915 0.1408 AML other m 2023-04-26T09:34:54.12
IV.SNTG.HHN. ML:1.0 0.000022780179999999998 0.1408 AML other m 2023-04-26T09:34:54.13
IV.SNTG.HNN. ML:1.7 0.00011308531000000001 0.8576 AML other m 2023-04-26T09:34:52.11
IV.EL6.EHN. ML:1.5 0.000074896985 1.7152 AML other m 2023-04-26T09:34:58.84
IV.EL6.EHE. ML:1.3 0.00004182158 0.1792 AML other m 2023-04-26T09:34:56.31
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