Earthquake with magnitude of ML 1.2 on date 24-10-2021 and time 17:34:28 (Italy) in region 2 km W Accumoli (RI)

A magnitude ML 1.2 earthquake occured in region: 2 km W Accumoli (RI), on

  • 24-10-2021 15:34:28 (UTC)
  • 24-10-2021 17:34:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.703, 13.222 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Accumoli RI 2 667 667
Amatrice RI 10 2657 3324
Arquata del Tronto AP 10 1178 4502
Cittareale RI 11 482 4984
Norcia PG 15 4957 9941
Acquasanta Terme AP 17 2916 12857
Cascia PG 17 3217 16074
Montegallo AP 18 523 16597
Montereale AQ 20 2581 19178

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
42 Km NW of L'Aquila (69753 inhabitants)
50 Km E of Terni (111501 inhabitants)
51 Km SE of Foligno (57155 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
81 Km SE of Perugia (166134 inhabitants)
85 Km W of Pescara (121014 inhabitants)
87 Km W of Chieti (51815 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km NE of Tivoli (56533 inhabitants)
97 Km E of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
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 the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.2 2021-10-24
15:34:28
42.7032 13.2222 11 2021-10-24
15:45:01
Sala Sismica INGV-Roma 96955331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-24 15:34:28 ± 0.06
Latitude 42.7032 ± 0.0036
Longitude 13.2222 ± 0.0061
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 96955331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 418
Semi-minor axis of confidence ellipse (meter) 364
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.38851
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 96955331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-24 15:45:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.VOBA.EHZ. 2021-10-24T15:36:15.28 3.0 undecidable manual Sg 12.01 0
IV.PTCC.HHZ. 2021-10-24T15:36:08.81 3.0 undecidable manual Sn 0.63 0
IV.CADC.EHZ. 2021-10-24T15:36:01.21 3.0 undecidable manual Sn -2.2 0
IV.MCPD.HHZ. 2021-10-24T15:35:49.55 3.0 undecidable manual Pg 12.54 0
IV.JOPP.HHZ. 2021-10-24T15:35:45.38 3.0 undecidable manual Pg 10.34 0
GU.MGRO.HHZ. 2021-10-24T15:35:30.75 3.0 undecidable manual Pn 1.17 0
IT.FIE.HGZ. 2021-10-24T15:35:19.53 3.0 undecidable manual Sn -0.78 0
IV.CMPR.HNZ. 2021-10-24T15:35:10.17 3.0 undecidable manual Pn -1.4 0
IV.FERS.HNZ. 2021-10-24T15:35:08.28 3.0 undecidable manual Pn 0.9 0
IX.NSC3.EHZ.02 2021-10-24T15:35:06.33 3.0 positive manual Pn 1.75 0
OT.OT17.EHZ. 2021-10-24T15:35:02.25 3.0 negative manual Pg 3.52 0
IV.ICAI.EHZ. 2021-10-24T15:35:00.90 3.0 undecidable manual Pn 0.56 0
IV.FIR.HHZ. 2021-10-24T15:34:58.98 3.0 undecidable manual Pg 1.81 0
IV.POFI.HNZ. 2021-10-24T15:34:45.77 3.0 undecidable manual P -0.94 0
IV.CSP1.EHZ. 2021-10-24T15:34:42.38 0.6 undecidable manual S 358 0.3885 50 0.19 46
IV.TERO.HHZ. 2021-10-24T15:34:38.95 0.3 undecidable manual S 106 0.2914 50 -0.37 68
IV.RM33.EHE. 2021-10-24T15:34:36.40 0.6 undecidable manual S 182 0.1943 50 -0.02 50
IV.CSP1.EHZ. 2021-10-24T15:34:36.26 0.6 negative manual P 358 0.3885 50 0.01 48
IV.LNSS.HHN. 2021-10-24T15:34:35.52 0.1 undecidable manual S 233 0.1673 120 -0.06 99
IV.TERO.HHZ. 2021-10-24T15:34:34.75 0.3 undecidable manual P 106 0.2914 50 0.16 71
IV.NRCA.HHZ. 2021-10-24T15:34:34.84 0.6 undecidable manual S 329 0.1529 122 -0.26 48
IV.SMA1.EHZ. 2021-10-24T15:34:33.72 0.6 undecidable manual S 131 0.1106 131 -0.08 50
IV.NRCA.HHZ. 2021-10-24T15:34:32.18 0.1 positive manual P 329 0.1529 122 0.02 100
IV.LNSS.HHN. 2021-10-24T15:34:32.42 0.1 undecidable manual P 233 0.1673 120 -0.01 100
IV.RM33.EHE. 2021-10-24T15:34:32.99 0.1 undecidable manual P 182 0.1943 50 0.07 98
IV.SMA1.EHZ. 2021-10-24T15:34:31.69 0.3 negative manual P 131 0.1106 131 0.28 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.8 7.085E-5 0.78 AML other m 2021-10-24T15:34:34.63
IV.NRCA.HHN. ML:1.4 0.00023 1.6 AML other m 2021-10-24T15:34:35.94
IV.NRCA.HHE. ML:1.8 0.0004775 0.14 AML other m 2021-10-24T15:34:35.08
IV.SMA1.EHN. ML:0.8 6.38E-5 0.84 AML other m 2021-10-24T15:34:35.68
IX.NSC3.EHE.02 ML:3.2 0.000247 0.1 AML other m 2021-10-24T15:35:59.16
IX.NSC3.EHN.02 ML:3.2 0.000243 0.86 AML other m 2021-10-24T15:36:00.49
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