Earthquake with magnitude of ML 0.8 on date 25-10-2021 and time 00:56:55 (Italy) in region 4 km W Amatrice (RI)

A magnitude ML 0.8 earthquake occured in region: 4 km W Amatrice (RI), on

  • 24-10-2021 22:56:55 (UTC)
  • 25-10-2021 00:56:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.622, 13.244 at 9 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
Amatrice RI 4 2657 2657
Cittareale RI 7 482 3139
Accumoli RI 8 667 3806
Montereale AQ 11 2581 6387
Capitignano AQ 12 665 7052
Campotosto AQ 13 542 7594
Borbona RI 15 617 8211
Posta RI 16 694 8905
Arquata del Tronto AP 17 1178 10083
Cagnano Amiterno AQ 18 1369 11452
Barete AQ 19 737 12189

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of L'Aquila (69753 inhabitants)
38 Km W of Teramo (54892 inhabitants)
49 Km E of Terni (111501 inhabitants)
58 Km SE of Foligno (57155 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
81 Km W of Pescara (121014 inhabitants)
82 Km W of Chieti (51815 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
96 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 0.8 2021-10-24
22:56:55
42.6223 13.2435 9 2021-10-24
23:06:27
Sala Sismica INGV-Roma 96966021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-24 22:56:55 ± 0.18
Latitude 42.6223 ± 0.0045
Longitude 13.2435 ± 0.0061
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96966021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 466
Semi-minor axis of confidence ellipse (meter) 335
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 355
Circular confidence region, given by single value of horizontal uncertainty (meter) 470
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 11
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
Epicentral distance of station farthest from the epicenter (degree) 0.2653
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96966021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-24 23:06:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2021-10-24T22:57:06.98 3.0 undecidable manual P -0.19 0
IV.FDMO.HHZ. 2021-10-24T22:57:06.74 3.0 negative manual P 2.52 0
IV.CESI.HHZ. 2021-10-24T22:57:05.10 3.0 negative manual P 0.52 0
IV.NRCA.HHZ. 2021-10-24T22:57:04.26 0.3 undecidable manual S 336 0.2311 109 -0.25 69
IV.LNSS.HNE. 2021-10-24T22:57:02.03 0.3 undecidable manual S 263 0.1511 118 0.38 68
IV.TERO.HHZ. 2021-10-24T22:57:01.52 0.6 undecidable manual P 90 0.2653 107 0.28 45
IV.NRCA.HHZ. 2021-10-24T22:57:00.36 0.3 negative manual P 336 0.2311 109 -0.17 70
IV.RM33.EHZ. 2021-10-24T22:57:00.21 0.1 undecidable manual S 191 0.1151 124 -0.27 93
IV.SMA1.EHN. 2021-10-24T22:56:59.14 0.1 undecidable manual S 83 0.0683 139 0.03 99
IV.LNSS.HNE. 2021-10-24T22:56:58.96 0.1 undecidable manual P 263 0.1511 118 0.08 96
IV.T1299.EHN. 2021-10-24T22:56:58.36 0.1 undecidable manual S 67 0.0306 159 0 100
IV.RM33.EHZ. 2021-10-24T22:56:58.13 0.1 undecidable manual P 191 0.1151 124 -0.07 97
IV.SMA1.EHN. 2021-10-24T22:56:57.51 0.3 undecidable manual P 83 0.0683 139 0.09 73
IV.T1299.EHN. 2021-10-24T22:56:57.08 0.3 undecidable manual P 67 0.0306 159 0.1 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.2 4.56E-5 0.12 AML other m 2021-10-24T22:57:06.70
IV.CESI.HHE. ML:1.3 4.81E-5 0.66 AML other m 2021-10-24T22:57:07.69
IV.RM33.EHE. ML:0.6 4.3893455E-5 0.1792 AML other m 2021-10-24T22:57:01.08
IV.RM33.EHN. ML:0.4 2.9700235E-5 0.4864 AML other m 2021-10-24T22:57:00.52
IV.NRCA.HHE. ML:0.7 3.0760295E-5 0.0896 AML other m 2021-10-24T22:57:04.47
IV.NRCA.HHN. ML:0.6 2.545284E-5 0.1152 AML other m 2021-10-24T22:57:04.36
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