Earthquake with magnitude of ML 2.1 on date 28-09-2021 and time 14:28:11 (Italy) in region 3 km E Vallo di Nera (PG)

A magnitude ML 2.1 earthquake occured in region: 3 km E Vallo di Nera (PG), on

  • 28-09-2021 12:28:11 (UTC)
  • 28-09-2021 14:28:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.777, 12.901 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vallo di Nera PG 3 364 364
Cerreto di Spoleto PG 5 1075 1439
Sant'Anatolia di Narco PG 7 564 2003
Poggiodomo PG 8 117 2120
Scheggino PG 9 461 2581
Campello sul Clitunno PG 11 2442 5023
Cascia PG 11 3217 8240
Sellano PG 13 1079 9319
Spoleto PG 14 38218 47537
Monteleone di Spoleto PG 15 599 48136
Norcia PG 16 4957 53093
Preci PG 16 724 53817
Trevi PG 17 8469 62286
Castel Ritaldi PG 19 3278 65564
Ferentillo TR 20 1913 67477

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km SE of Foligno (57155 inhabitants)
32 Km NE of Terni (111501 inhabitants)
56 Km SE of Perugia (166134 inhabitants)
62 Km NW of L'Aquila (69753 inhabitants)
67 Km W of Teramo (54892 inhabitants)
76 Km NE of Viterbo (67173 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
91 Km N of Tivoli (56533 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
Reviewed
Rev100
ML 2.1 2021-09-28
12:28:11
42.7772 12.9012 10 2021-09-28
12:36:52
Sala Sismica INGV-Roma 95992171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-28 12:28:11 ± 0.09
Latitude 42.7772 ± 0.0054
Longitude 12.9012 ± 0.0074
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95992171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 604
Semi-minor axis of confidence ellipse (meter) 522
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 144
Circular confidence region, given by single value of horizontal uncertainty (meter) 600
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 52
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.38491
Number of stations at which the event was observed 42
Number of stations from which data was used for origin computation 9
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.8
Num. used stations 14
Type of magnitude ML
Reference to an origin 95992171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-28 12:36:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
HL.VLS.HHZ. 2021-09-28T12:29:52.33 3.0 positive manual Pn -5.01 0
IV.EUCT.HNZ. 2021-09-28T12:29:48.88 3.0 undecidable manual Sg 11.12 0
MN.TRI.HHZ. 2021-09-28T12:29:45.86 3.0 undecidable manual Sg 14.01 0
IX.SCL3.EHZ.02 2021-09-28T12:29:44.86 3.0 undecidable manual Sg 14.38 0
OX.CIMO.HHZ. 2021-09-28T12:29:43.25 3.0 undecidable manual Sn 0.75 0
IV.EVRN.HHZ. 2021-09-28T12:29:42.01 3.0 negative manual Pg 16.34 0
IV.MTTG.HHZ. 2021-09-28T12:29:34.78 3.0 undecidable manual Pg 10.44 0
GU.LSD.HHZ. 2021-09-28T12:29:24.01 3.0 undecidable manual Pg 9.23 0
IV.TREG.EHZ. 2021-09-28T12:29:24.65 3.0 undecidable manual Sn -1.7 0
IV.PETRA.HHZ. 2021-09-28T12:29:23.31 3.0 undecidable manual Pg 3.07 0
IV.CSLB.HHZ. 2021-09-28T12:29:23.76 3.0 positive manual Pg 5.06 0
MN.PDG.HHZ. 2021-09-28T12:29:21.98 3.0 positive manual Pn 0.91 0
IV.MNTV.EHZ. 2021-09-28T12:29:19.50 3.0 undecidable manual Sn -0.68 0
IV.ILOS.HHZ. 2021-09-28T12:29:17.58 3.0 negative manual Pg 2.25 0
IV.IACL.HHZ. 2021-09-28T12:29:14.10 3.0 negative manual Pg 2.26 0
SL.BOJS.BHZ. 2021-09-28T12:29:11.67 3.0 undecidable manual Pg 12.96 0
IV.SBPO.HNZ. 2021-09-28T12:29:10.95 3.0 undecidable manual Sn -6.09 0
IV.MTGR.HHZ. 2021-09-28T12:29:09.09 3.0 negative manual Pn -7.95 0
IV.EUCT.HNZ. 2021-09-28T12:29:03.29 3.0 positive manual Pg 5.69 0
NI.VINO.HHZ. 2021-09-28T12:29:02.92 3.0 positive manual Pn 2.62 0
IT.PLTA.HNZ. 2021-09-28T12:29:01.29 3.0 undecidable manual Sn -1.82 0
GU.BURY.HHZ. 2021-09-28T12:28:56.21 3.0 undecidable manual Pn -4.94 0
IV.CADC.EHZ. 2021-09-28T12:28:51.07 3.0 positive manual Pn -3.38 0
IV.OVO.HHZ. 2021-09-28T12:28:51.70 3.0 undecidable manual Pg 7.56 0
IV.POFI.HHZ. 2021-09-28T12:28:49.12 3.0 undecidable manual Sg -0.05 0
IV.VTIR.HHZ. 2021-09-28T12:28:41.35 3.0 positive manual Pn -3.21 0
IV.MNTT.EHZ. 2021-09-28T12:28:35.45 3.0 undecidable manual Sn -3.04 0
IV.PP3.EHZ. 2021-09-28T12:28:31.90 3.0 negative manual Pg 5.43 0
IV.BRSN.EHZ. 2021-09-28T12:28:29.17 3.0 negative manual Pn -3.43 0
IV.CRTC.HHZ. 2021-09-28T12:28:27.57 3.0 undecidable manual Pg 1.26 0
IV.CSP1.EHZ. 2021-09-28T12:28:26.39 0.6 undecidable manual S 35 0.3849 50 0.66 41
IV.RMP.HHZ. 2021-09-28T12:28:26.39 3.0 undecidable manual Sn -9.99 0
IV.RM33.EHZ. 2021-09-28T12:28:25.08 0.3 undecidable manual S 139 0.3534 50 0.28 68
IV.VVLD.HHZ. 2021-09-28T12:28:24.75 3.0 undecidable manual Pn -3.45 0
IV.FDMO.HHZ. 2021-09-28T12:28:22.94 0.3 undecidable manual S 28 0.2932 50 -0.06 73
IV.CESI.HHZ. 2021-09-28T12:28:21.04 0.3 undecidable manual S 1 0.2275 50 -0.03 74
IV.MC2.EHZ. 2021-09-28T12:28:21.82 0.3 undecidable manual S 57 0.25 50 0.09 73
IV.MOMA.HNE. 2021-09-28T12:28:21.70 0.3 undecidable manual S 276 0.2446 50 0.14 72
IV.LNSS.HHZ. 2021-09-28T12:28:20.21 0.3 undecidable manual S 150 0.2023 115 -0.02 74
IV.CSP1.EHZ. 2021-09-28T12:28:20.04 0.1 undecidable manual P 35 0.3849 50 0.25 91
IV.RM33.EHZ. 2021-09-28T12:28:18.13 0.3 undecidable manual P 139 0.3534 50 -1.12 50
IV.ATMI.HHZ. 2021-09-28T12:28:18.39 3.0 positive manual P -0.61 0
IV.NRCA.HHZ. 2021-09-28T12:28:18.84 0.1 undecidable manual S 70 0.1664 119 -0.16 97
IV.FDMO.HHZ. 2021-09-28T12:28:18.05 0.1 undecidable manual P 28 0.2932 50 -0.17 95
IV.MOMA.HNE. 2021-09-28T12:28:17.19 0.1 undecidable manual P 276 0.2446 50 -0.19 95
IV.MC2.EHZ. 2021-09-28T12:28:17.52 0.1 undecidable manual P 57 0.25 50 0.04 98
IV.LNSS.HHZ. 2021-09-28T12:28:16.69 0.1 undecidable manual P 150 0.2023 115 0.08 98
IV.GAVE.EHZ. 2021-09-28T12:28:16.59 0.3 undecidable manual S 183 0.0854 137 0.08 75
IV.CESI.HHZ. 2021-09-28T12:28:16.98 0.1 undecidable manual P 1 0.2275 50 -0.12 97
IV.NRCA.HHZ. 2021-09-28T12:28:15.89 0.1 undecidable manual P 70 0.1664 119 -0.01 100
IV.GAVE.EHZ. 2021-09-28T12:28:14.71 0.1 undecidable manual P 183 0.0854 137 0.24 97
IV.ARRO.EHZ. 2021-09-28T12:28:13.59 3.0 undecidable manual P -0.23 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.2 0.0002115 0.82 AML other m 2021-09-28T12:28:16.64
IV.GAVE.EHE. ML:1.2 0.000224 1.52 AML other m 2021-09-28T12:28:16.89
IV.NRCA.HHN. ML:1.1 0.0001033 0.08 AML other m 2021-09-28T12:28:19.41
IV.NRCA.HHE. ML:1 8.62E-5 0.1 AML other m 2021-09-28T12:28:20.32
IV.CESI.HHE. ML:0.8 3.345E-5 0.76 AML other m 2021-09-28T12:28:21.12
IV.CESI.HHN. ML:0.9 4.295E-5 1.64 AML other m 2021-09-28T12:28:23.17
IV.CRTC.HHE. ML:2.1 0.000112 0.54 AML other m 2021-09-28T12:28:33.58
IV.CRTC.HHN. ML:2.3 0.000155 0.96 AML other m 2021-09-28T12:28:46.47
IV.MNTT.EHE. ML:2.6 0.000738 0.08 AML other m 2021-09-28T12:28:56.44
IV.MNTT.EHN. ML:2.2 0.000293 0.6 AML other m 2021-09-28T12:28:56.25
IV.SBPO.HNE. ML:4.6 0.004865 0.06 AML other m 2021-09-28T12:29:12.93
IV.SBPO.HNN. ML:3.9 0.00098 0.06 AML other m 2021-09-28T12:29:13.05
GU.BURY.HHN. ML:3.4 9.335E-5 0.08 AML other m 2021-09-28T12:29:16.26
GU.BURY.HHE. ML:3.2 7.615E-5 0.72 AML other m 2021-09-28T12:29:20.59
IV.TREG.EHN. ML:3.1 0.000124 1.54 AML other m 2021-09-28T12:29:41.87
IV.TREG.EHE. ML:3.2 0.0001525 0.1 AML other m 2021-09-28T12:29:58.83
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, http://terremoti.ingv.it/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