Earthquake with magnitude of ML 2.3 on date 23-10-2021 and time 16:40:33 (UTC) in region 7 km SE Norcia (PG)

A magnitude ML 2.3 earthquake occured in region: 7 km SE Norcia (PG), on

  • 23-10-2021 16:40:33 (UTC)
  • 23-10-2021 18:40:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7580, 13.1580 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.

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 7 4957 4957
Accumoli RI 10 667 5624
Arquata del Tronto AP 12 1178 6802
Cascia PG 13 3217 10019
Castelsantangelo sul Nera MC 15 281 10300
Cittareale RI 16 482 10782
Preci PG 17 724 11506
Montegallo AP 17 523 12029
Amatrice RI 18 2657 14686
Poggiodomo PG 19 117 14803

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km SE of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
74 Km SE of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km W of Pescara (121014 inhabitants)
93 Km NE of Tivoli (56533 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
94 Km W of Chieti (51815 inhabitants)
100 Km SW of Ancona (100861 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 2.3 2021-10-23
16:40:33
42.7582 13.1582 10 2022-03-30
13:04:13
Bollettino Sismico Italiano INGV 96980331
Reviewed
Rev100
ML 2.3 2021-10-23
16:40:33
42.7603 13.1633 11 2021-10-23
17:01:49
Sala Sismica INGV-Roma 96913541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 16:40:33 ± 0.04
Latitude 42.7582 ± 0.0027
Longitude 13.1582 ± 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 96980331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 283
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 82
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) 32
Number of associated phases, regardless of their use for origin computation 69
Number of defining phases 65
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.95058
Number of stations at which the event was observed 44
Number of stations from which data was used for origin computation 40
Magnitudes information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 39
Type of magnitude ML
Reference to an origin 96980331
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-16 16:33:07

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 39
Type of magnitude ML
Reference to an origin 96913541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 17:01:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IX.SRN3.HHZ.02 2021-10-23T16:42:02.36 3.0 undecidable manual Sg 10.13 0
IV.PAOL.HHZ. 2021-10-23T16:41:35.11 3.0 undecidable manual Sg 3.15 0
OT.OT17.EHZ. 2021-10-23T16:41:32.60 3.0 undecidable manual Sn 2.06 0
IV.CELB.HHZ. 2021-10-23T16:41:08.26 3.0 undecidable manual Pn 0.15 0
IV.FIAM.HHZ. 2021-10-23T16:40:50.41 0.6 undecidable manual S 184 0.4910 50 0.15 46
IV.NARO.HHZ. 2021-10-23T16:40:50.95 0.3 undecidable manual P 334 0.9506 50 0.11 63
IV.MPAG.EHZ. 2021-10-23T16:40:50.82 0.3 undecidable manual P 342 0.9173 50 0.54 57
IV.CESX.HHZ. 2021-10-23T16:40:49.33 0.6 undecidable manual S 251 0.4461 50 0.41 44
IV.FRON.EHZ. 2021-10-23T16:40:49.12 0.3 undecidable manual P 338 0.8220 50 0.47 60
IV.ASSB.HHZ. 2021-10-23T16:40:49.61 0.6 undecidable manual S 308 0.4632 50 0.17 46
IV.INTR.HHZ. 2021-10-23T16:40:49.88 0.6 undecidable manual P 143 0.9272 50 -0.57 38
IV.MOMA.HHZ. 2021-10-23T16:40:49.19 0.6 undecidable manual S 276 0.4335 50 0.62 41
IV.ARVD.HHZ. 2021-10-23T16:40:47.54 0.3 undecidable manual P 348 0.7563 50 0.02 67
IV.SAP2.EHZ. 2021-10-23T16:40:47.82 0.6 undecidable manual S 27 0.3813 50 0.8 39
IV.SSFR.HHZ. 2021-10-23T16:40:47.48 0.3 undecidable manual P 338 0.7311 50 0.39 62
IV.T0110.HHZ. 2021-10-23T16:40:46.64 0.3 undecidable manual P 139 0.6979 50 0.12 66
IV.MML1.EHZ. 2021-10-23T16:40:46.99 0.6 undecidable manual S 339 0.3804 50 0 48
IV.GUMA.HHZ. 2021-10-23T16:40:45.84 0.3 undecidable manual S 23 0.3310 50 0.32 69
IV.MF5.EHZ. 2021-10-23T16:40:45.86 0.6 undecidable manual S 44 0.3184 50 0.71 41
IV.TRTR.HHZ. 2021-10-23T16:40:45.21 0.3 undecidable manual P 85 0.5567 50 1.11 49
IV.TERO.HHZ. 2021-10-23T16:40:45.77 0.6 undecidable manual S 112 0.3543 50 -0.44 44
IV.FOSV.EHZ. 2021-10-23T16:40:45.11 0.3 undecidable manual P 332 0.6097 50 0.09 68
IV.ARRO.EHZ. 2021-10-23T16:40:45.77 0.6 undecidable manual S 238 0.3390 50 0 49
IV.VCEL.EHZ. 2021-10-23T16:40:45.42 0.3 undecidable manual P 126 0.6196 50 0.23 66
IV.CSP1.EHZ. 2021-10-23T16:40:45.37 0.3 undecidable manual S 6 0.3354 50 -0.28 69
IV.ATCC.EHZ. 2021-10-23T16:40:44.33 0.3 undecidable manual P 319 0.5711 50 -0.02 70
IV.EL6.EHZ. 2021-10-23T16:40:44.07 0.3 undecidable manual P 356 0.5720 50 -0.3 66
IV.CESI.HHZ. 2021-10-23T16:40:44.84 0.3 undecidable manual S 323 0.3085 50 -0.03 73
IV.CING.HHZ. 2021-10-23T16:40:44.87 0.3 undecidable manual P 3 0.6178 50 -0.28 65
IV.FDMO.HHZ. 2021-10-23T16:40:43.60 0.3 undecidable manual S 349 0.2833 50 -0.5 67
IV.CAMP.HHZ. 2021-10-23T16:40:43.94 0.3 undecidable manual S 140 0.2887 50 -0.33 69
IV.RM33.EHZ. 2021-10-23T16:40:43.09 0.3 undecidable manual S 171 0.2527 50 -0.11 73
IT.MTCL.HGZ. 2021-10-23T16:40:43.55 0.3 undecidable manual S 334 0.2626 50 0.05 74
IV.FIAM.HHZ. 2021-10-23T16:40:42.70 0.1 undecidable manual P 184 0.4910 50 -0.28 89
IV.ASSB.HHZ. 2021-10-23T16:40:42.16 0.3 undecidable manual P 308 0.4632 50 -0.35 66
IV.MNTT.EHZ. 2021-10-23T16:40:42.81 0.1 undecidable manual P 46 0.4416 50 0.68 80
IV.OFFI.HHZ. 2021-10-23T16:40:42.41 0.3 undecidable manual P 65 0.4254 50 0.56 63
IV.MOMA.HHZ. 2021-10-23T16:40:41.93 0.1 undecidable manual P 276 0.4335 50 -0.08 94
IV.FEMA.HNZ. 2021-10-23T16:40:41.74 0.3 undecidable manual S 339 0.2185 113 -0.42 69
IV.CESX.HHZ. 2021-10-23T16:40:41.99 0.1 undecidable manual P 251 0.4461 50 -0.22 91
IV.LNSS.HNZ. 2021-10-23T16:40:41.01 0.3 undecidable manual S 209 0.1781 117 0.29 71
IV.GAVE.EHZ. 2021-10-23T16:40:41.76 0.3 undecidable manual S 251 0.2050 114 0.1 74
IV.SAP2.EHZ. 2021-10-23T16:40:41.30 0.1 undecidable manual P 27 0.3813 50 0.19 93
IV.MMO1.EHZ. 2021-10-23T16:40:40.73 0.3 undecidable manual S 41 0.1880 116 -0.33 70
IV.ARRO.EHZ. 2021-10-23T16:40:40.24 0.1 undecidable manual P 238 0.3390 50 -0.15 95
IV.MC2.EHZ. 2021-10-23T16:40:40.05 0.3 undecidable manual S 8 0.1547 120 0.11 74
IV.SMA1.EHZ. 2021-10-23T16:40:40.91 0.3 undecidable manual S 134 0.1826 116 0.04 75
IV.CSP1.EHZ. 2021-10-23T16:40:40.03 0.1 undecidable manual P 6 0.3354 50 -0.29 92
IV.MML1.EHZ. 2021-10-23T16:40:40.83 0.3 undecidable manual P 339 0.3804 50 -0.26 69
IV.MTRA.HNZ. 2021-10-23T16:40:40.28 0.3 undecidable manual S 90 0.1745 117 -0.34 70
IV.GUMA.HHZ. 2021-10-23T16:40:40.33 0.1 undecidable manual P 23 0.3310 50 0.09 96
IV.MF5.EHZ. 2021-10-23T16:40:40.13 0.1 undecidable manual P 44 0.3184 50 0.1 96
IV.T1299.HNZ. 2021-10-23T16:40:40.24 0.3 undecidable manual S 144 0.1538 121 0.33 71
IV.TERO.HHZ. 2021-10-23T16:40:40.21 0.1 undecidable manual P 112 0.3543 50 -0.43 89
IV.CESI.HHZ. 2021-10-23T16:40:39.63 0.1 undecidable manual P 323 0.3085 50 -0.24 93
IV.FDMO.HHZ. 2021-10-23T16:40:39.12 0.1 undecidable manual P 349 0.2833 50 -0.3 93
IV.CAMP.HHZ. 2021-10-23T16:40:39.28 0.1 undecidable manual P 140 0.2887 50 -0.24 94
IV.RM33.EHZ. 2021-10-23T16:40:38.70 0.1 undecidable manual P 171 0.2527 50 -0.2 95
IV.GAVE.EHZ. 2021-10-23T16:40:38.02 0.1 undecidable manual P 251 0.2050 114 0 100
IT.MTCL.HGZ. 2021-10-23T16:40:38.86 0.1 undecidable manual P 334 0.2626 50 -0.22 95
IV.FEMA.HNZ. 2021-10-23T16:40:38.22 0.3 undecidable manual P 339 0.2185 113 -0.08 74
IV.NRCA.HNZ. 2021-10-23T16:40:37.75 0.3 undecidable manual S 337 0.0818 138 0.01 77
IV.T1299.HNZ. 2021-10-23T16:40:37.28 0.1 undecidable manual P 144 0.1538 121 0.28 95
IV.MMO1.EHZ. 2021-10-23T16:40:37.47 0.1 undecidable manual P 41 0.1880 116 -0.2 96
IV.MC2.EHZ. 2021-10-23T16:40:37.09 0.1 undecidable manual P 8 0.1547 120 0.06 100
IV.SMA1.EHZ. 2021-10-23T16:40:37.52 0.1 undecidable manual P 134 0.1826 116 -0.04 100
IV.MTRA.HNZ. 2021-10-23T16:40:37.26 0.1 undecidable manual P 90 0.1745 117 -0.15 98
IV.LNSS.HNZ. 2021-10-23T16:40:37.59 0.1 undecidable manual P 209 0.1781 117 0.12 98
IV.NRCA.HNZ. 2021-10-23T16:40:35.94 0.1 undecidable manual P 337 0.0818 138 0.19 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.6 0.006312493 0.0512 AML other m 2021-10-23T16:40:37.80
IV.NRCA.HHN. ML:2.7 0.0071600000000000006 0.06 AML other m 2021-10-23T16:40:37.78
IV.NRCA.HNE. ML:2.9 0.011042584999999999 1.8848 AML other m 2021-10-23T16:40:38.04
IV.NRCA.HHE. ML:2.9 0.011982469999999999 1.872 AML other m 2021-10-23T16:40:38.05
IV.MTRA.HNE. ML:2.3 0.0015228429999999999 0.4224 AML other m 2021-10-23T16:40:40.54
IV.MTRA.EHE. ML:2.3 0.0014812275 0.2944 AML other m 2021-10-23T16:40:40.55
IV.MTRA.HNN. ML:2.2 0.00131 0.28 AML other m 2021-10-23T16:40:40.72
IV.MTRA.EHN. ML:2.2 0.0013199999999999998 0.28 AML other m 2021-10-23T16:40:40.72
IV.LNSS.HNE. ML:2.2 0.00113 0.18 AML other m 2021-10-23T16:40:41.44
IV.LNSS.HHN. ML:2.3 0.001465 0.16 AML other m 2021-10-23T16:40:41.89
IV.LNSS.HNN. ML:2.2 0.00133 0.16 AML other m 2021-10-23T16:40:41.97
IV.GAVE.HNE. ML:2.4 0.0018454760000000002 0.128 AML other m 2021-10-23T16:40:42.32
IV.GAVE.EHE. ML:2.5 0.002004225 0.1408 AML other m 2021-10-23T16:40:42.32
IV.GAVE.EHN. ML:2.5 0.00198 0.14 AML other m 2021-10-23T16:40:42.35
IV.GAVE.HNN. ML:2.0 0.0006129999999999999 0.14 AML other m 2021-10-23T16:40:42.28
IV.LNSS.HHE. ML:2.2 0.0012230000000000001 0.1 AML other m 2021-10-23T16:40:42.82
IV.RM33.HNE. ML:2.1 0.0007030000000000001 0.12 AML other m 2021-10-23T16:40:43.56
IV.RM33.EHE. ML:2.1 0.00068083705 0.1152 AML other m 2021-10-23T16:40:43.50
IV.SMA1.EHE. ML:2.1 0.000911 0.38 AML other m 2021-10-23T16:40:44.30
IV.CAMP.HHE. ML:1.3 0.00008554322999999999 0.1536 AML other m 2021-10-23T16:40:44.13
IV.RM33.HNN. ML:2.1 0.00072679195 0.2176 AML other m 2021-10-23T16:40:44.51
IV.RM33.EHN. ML:2.1 0.00071069265 0.2176 AML other m 2021-10-23T16:40:44.52
IV.CESI.HHE. ML:1.8 0.0002356311 0.1024 AML other m 2021-10-23T16:40:45.80
IV.CSP1.EHE. ML:2.4 0.0008932571499999999 0.1664 AML other m 2021-10-23T16:40:46.18
IV.GUMA.HNN. ML:2.4 0.0010956065 0.2944 AML other m 2021-10-23T16:40:46.37
IV.GUMA.HHN. ML:2.6 0.0015224675 0.2176 AML other m 2021-10-23T16:40:46.39
IV.GUMA.HNE. ML:2.5 0.0013361962499999999 0.192 AML other m 2021-10-23T16:40:46.41
IV.MF5.EHE. ML:2.1 0.0005391776500000001 0.192 AML other m 2021-10-23T16:40:46.97
IV.GUMA.HHE. ML:2.6 0.001404555 0.1792 AML other m 2021-10-23T16:40:47.28
IV.CSP1.EHN. ML:2.4 0.0010183399 0.4224 AML other m 2021-10-23T16:40:47.56
IV.CESI.HHN. ML:1.8 0.000288796 0.3584 AML other m 2021-10-23T16:40:47.81
IV.SAP2.EHE. ML:2.2 0.0005717428 0.1664 AML other m 2021-10-23T16:40:48.13
IV.SAP2.EHN. ML:3.0 0.003112976 0.1664 AML other m 2021-10-23T16:40:49.82
IV.MOMA.HNE. ML:2.2 0.0004025062 0.192 AML other m 2021-10-23T16:40:50.25
IV.MOMA.HHE. ML:2.2 0.00041357845000000005 0.1792 AML other m 2021-10-23T16:40:50.25
IV.MOMA.HHN. ML:2.0 0.00026985285 0.1792 AML other m 2021-10-23T16:40:50.61
IV.MOMA.HNN. ML:2.0 0.00025709729999999996 0.1792 AML other m 2021-10-23T16:40:50.61
IV.CESX.HHE. ML:1.9 0.0002113114 0.1408 AML other m 2021-10-23T16:40:50.73
IV.CESX.HHN. ML:1.9 0.00019242205 0.2176 AML other m 2021-10-23T16:40:50.80
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download