Earthquake with magnitude of ML 1.2 on date 20-09-2021 and time 17:47:55 (UTC) in region 1 km NE Montereale (AQ)

A magnitude ML 1.2 earthquake occured in region: 1 km NE Montereale (AQ), on

  • 20-09-2021 17:47:55 (UTC)
  • 20-09-2021 19:47:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.533, 13.256 at 16 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
Montereale AQ 1 2581 2581
Capitignano AQ 4 665 3246
Cagnano Amiterno AQ 8 1369 4615
Barete AQ 9 737 5352
Campotosto AQ 10 542 5894
Borbona RI 10 617 6511
Pizzoli AQ 11 4326 10837
Amatrice RI 11 2657 13494
Cittareale RI 12 482 13976
Posta RI 13 694 14670
Scoppito AQ 18 3727 18397
Accumoli RI 18 667 19064
Crognaleto TE 19 1297 20361
Micigliano RI 19 127 20488
Antrodoco RI 19 2588 23076

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of L'Aquila (69753 inhabitants)
39 Km W of Teramo (54892 inhabitants)
50 Km E of Terni (111501 inhabitants)
65 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
73 Km NE of Guidonia Montecelio (88673 inhabitants)
74 Km NE of Tivoli (56533 inhabitants)
78 Km W of Chieti (51815 inhabitants)
79 Km W of Pescara (121014 inhabitants)
95 Km E of Viterbo (67173 inhabitants)
95 Km NE of Roma (2864731 inhabitants)
95 Km SE of Perugia (166134 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 2021-09-20
17:47:55
42.5327 13.2558 16 2021-09-20
17:52:37
Sala Sismica INGV-Roma 95670381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 17:47:55 ± 0.19
Latitude 42.5327 ± 0.0090
Longitude 13.2558 ± 0.0098
Depth (km) 16 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95670381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 970
Semi-minor axis of confidence ellipse (meter) 497
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 345
Circular confidence region, given by single value of horizontal uncertainty (meter) 970
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 162
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.31836
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 95670381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-20 17:52:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PTRJ.HHZ. 2021-09-20T17:48:19.13 3.0 undecidable manual Pn -0.35 0
IV.ATMI.HHZ. 2021-09-20T17:48:14.85 3.0 undecidable manual P 0.57 0
IV.MNTT.EHZ. 2021-09-20T17:48:06.09 3.0 negative manual P -0.83 0
IV.NRCA.HHZ. 2021-09-20T17:48:06.84 0.6 undecidable manual S 341 0.3184 102 -0.26 46
IV.TERO.HHZ. 2021-09-20T17:48:05.24 0.6 undecidable manual S 70 0.2716 105 -0.52 44
IV.NRCA.HHZ. 2021-09-20T17:48:02.08 1.0 negative manual P 341 0.3184 102 0.05 24
IV.LNSS.HHZ. 2021-09-20T17:48:02.89 0.6 undecidable manual S 294 0.1736 118 -0.15 49
IV.SMA1.EHZ. 2021-09-20T17:48:01.64 0.6 undecidable manual S 31 0.1142 133 0.05 50
IV.TERO.HHZ. 2021-09-20T17:48:01.33 0.6 undecidable manual P 70 0.2716 105 0.08 48
IV.RM33.EHZ. 2021-09-20T17:48:00.06 0.6 undecidable manual S 232 0.0387 162 -0.31 48
IV.SMA1.EHZ. 2021-09-20T17:47:59.11 0.1 negative manual P 31 0.1142 133 0.27 96
IV.LNSS.HHZ. 2021-09-20T17:47:59.77 0.1 positive manual P 294 0.1736 118 0.09 98
IV.RM33.EHZ. 2021-09-20T17:47:58.27 0.1 negative manual P 232 0.0387 162 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RM33.EHN. ML:1.4 0.0002585 0.28 AML other m 2021-09-20T17:48:00.19
IV.RM33.EHE. ML:1.3 0.0002255 0.16 AML other m 2021-09-20T17:48:00.53
IV.SMA1.EHN. ML:1.1 0.0001105 1.66 AML other m 2021-09-20T17:48:01.07
IV.SMA1.EHE. ML:1.4 0.000235 0.18 AML other m 2021-09-20T17:48:02.02
IV.LNSS.HHE. ML:1.1 8.55E-5 0.1 AML other m 2021-09-20T17:48:03.20
IV.LNSS.HHN. ML:1.1 7.295E-5 0.4 AML other m 2021-09-20T17:48:03.47
IV.MNTT.EHE. ML:2.6 0.00069 1.58 AML other m 2021-09-20T17:48:29.95
IV.MNTT.EHN. ML:2.2 0.0003055 0.56 AML other m 2021-09-20T17:48:30.08
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