Earthquake with magnitude of ML 1.5 on date 24-03-2021 and time 00:11:31 (Italy) in region 7 km N Montecchio (TR)

A magnitude ML 1.5 earthquake occured in region: 7 km N Montecchio (TR), on

  • 23-03-2021 23:11:31 (UTC)
  • 24-03-2021 00:11:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7260, 12.2830 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
Montecchio TR 7 1676 1676
Baschi TR 8 2722 4398
Castiglione in Teverina VT 11 2329 6727
Guardea TR 11 1836 8563
Todi PG 12 16851 25414
Monte Castello di Vibio PG 14 1567 26981
Orvieto TR 14 20630 47611
Avigliano Umbro TR 14 2558 50169
Alviano TR 15 1463 51632
Civitella d'Agliano VT 15 1640 53272
Porano TR 15 1966 55238
San Venanzo TR 16 2218 57456
Fratta Todina PG 16 1839 59295
Lugnano in Teverina TR 17 1494 60789
Lubriano VT 17 909 61698
Graffignano VT 18 2292 63990
Bagnoregio VT 19 3650 67640
Montecastrilli TR 19 5022 72662

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km NW of Terni (111501 inhabitants)
37 Km NE of Viterbo (67173 inhabitants)
43 Km SW of Foligno (57155 inhabitants)
43 Km S of Perugia (166134 inhabitants)
81 Km NE of Civitavecchia (52991 inhabitants)
89 Km NW of Guidonia Montecelio (88673 inhabitants)
89 Km SE of Arezzo (99543 inhabitants)
94 Km N of Roma (2864731 inhabitants)
95 Km NW of Tivoli (56533 inhabitants)
96 Km E of Grosseto (82087 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 1.5 2021-03-23
23:11:31
42.726 12.283 10 2021-07-12
16:55:17
Bollettino Sismico Italiano INGV 92157581
Reviewed
Rev100
ML 1.5 2021-03-23
23:11:31
42.713 12.2817 7 2021-03-23
23:21:26
Sala Sismica INGV-Roma 88421751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-23 23:11:31 ± 0.12
Latitude 42.7260 ± 0.0081
Longitude 12.2830 ± 0.0073
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 92157581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 847
Semi-minor axis of confidence ellipse (meter) 424
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 28
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.22483
Epicentral distance of station farthest from the epicenter (degree) 0.60794
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 92157581
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-02 16:36:48

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 88421751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-23 23:21:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-03-23T23:11:43.02 0.3 undecidable manual P 18 0.5648 50 0.4 65
IV.ATMI.HHZ. 2021-03-23T23:11:43.49 0.6 undecidable manual P 359 0.6079 50 0.14 45
IV.SACS.HHZ. 2021-03-23T23:11:43.09 0.6 undecidable manual S 294 0.3004 50 0.08 49
IV.SRES.HHN. 2021-03-23T23:11:41.63 0.6 undecidable manual P 161 0.5162 50 -0.16 46
IV.BARO.HNZ. 2021-03-23T23:11:41.51 0.6 undecidable manual P 200 0.5072 50 -0.13 46
IV.ATVA.EHE. 2021-03-23T23:11:41.90 0.3 undecidable manual P 0 0.5522 50 -0.5 64
IT.GNU.HGE. 2021-03-23T23:11:40.54 0.6 undecidable manual S 70 0.2248 111 -0.12 49
IV.MGAB.HHZ. 2021-03-23T23:11:40.71 0.6 undecidable manual S 326 0.2248 111 0.05 50
IV.MOMA.HHZ. 2021-03-23T23:11:40.44 0.6 undecidable manual S 70 0.2248 111 -0.22 48
IV.ASSB.HHN. 2021-03-23T23:11:39.94 0.3 undecidable manual P 41 0.4191 50 -0.19 70
IV.ARRO.EHZ. 2021-03-23T23:11:39.69 0.3 undecidable manual P 112 0.3840 50 0.17 71
IV.SACS.HHZ. 2021-03-23T23:11:38.22 0.1 undecidable manual P 294 0.3004 50 0.13 97
IV.CESX.HHZ. 2021-03-23T23:11:37.17 0.3 undecidable manual P 118 0.2518 50 -0.1 74
IT.GNU.HGE. 2021-03-23T23:11:37.31 0.3 undecidable manual P 70 0.2248 111 0.58 66
IV.MGAB.HHZ. 2021-03-23T23:11:36.58 0.1 undecidable manual P 326 0.2248 111 -0.16 98
IV.MOMA.HHZ. 2021-03-23T23:11:36.69 0.1 undecidable manual P 70 0.2248 111 -0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHN. ML:1.2 0.0000967 0.22 AML other m 2021-03-23T23:11:42.13
IV.MGAB.HHE. ML:1.6 0.0002215 0.3 AML other m 2021-03-23T23:11:42.35
IV.MOMA.HHE. ML:1.2 0.00009164999999999999 1.14 AML other m 2021-03-23T23:11:43.78
IV.MGAB.HHN. ML:1.7 0.000277 0.92 AML other m 2021-03-23T23:11:45.56
IV.ARRO.EHN. ML:1.3 0.00006405 1.58 AML other m 2021-03-23T23:11:47.16
IV.ARRO.EHE. ML:1.2 0.00004405 0.58 AML other m 2021-03-23T23:11:50.48
IV.MURB.HHE. ML:1.8 0.0001285 0.24 AML other m 2021-03-23T23:11:54.76
IV.MURB.HHN. ML:1.9 0.0001395 0.86 AML other m 2021-03-23T23:11:58.21
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