Earthquake with magnitude of ML 1.2 on date 20-10-2021 and time 20:47:47 (Italy) in region 4 km S Acri (CS)

A magnitude ML 1.2 earthquake occured in region: 4 km S Acri (CS), on

  • 20-10-2021 18:47:47 (UTC)
  • 20-10-2021 20:47:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.458, 16.371 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
Acri CS 4 20858 20858
Luzzi CS 7 9396 30254
Rose CS 9 4373 34627
Bisignano CS 10 10203 44830
Santa Sofia d'Epiro CS 11 2628 47458
San Demetrio Corone CS 12 3559 51017
San Pietro in Guarano CS 14 3663 54680
Castiglione Cosentino CS 14 2896 57576
San Cosmo Albanese CS 15 591 58167
Vaccarizzo Albanese CS 15 1125 59292
San Giorgio Albanese CS 16 1432 60724
Lappano CS 16 941 61665
Celico CS 17 2802 64467
Rovito CS 17 3158 67625
Zumpano CS 18 2570 70195
Spezzano della Sila CS 18 4541 74736
Spezzano Piccolo CS 19 2079 76815
Montalto Uffugo CS 19 19669 96484
Tarsia CS 20 2054 98538
Casole Bruzio CS 20 2578 101116
Trenta CS 20 2633 103749
Serra Pedace CS 20 986 104735

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NE of Cosenza (67546 inhabitants)
54 Km N of Lamezia Terme (70714 inhabitants)
64 Km N of Catanzaro (90612 inhabitants)
77 Km NW of Crotone (62178 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 2021-10-20
18:47:47
39.4585 16.3713 11 2021-10-20
19:07:25
Sala Sismica INGV-Roma 96807321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 18:47:47 ± 0.07
Latitude 39.4585 ± 0.0036
Longitude 16.3713 ± 0.0082
Depth (km) 11 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96807321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 664
Semi-minor axis of confidence ellipse (meter) 408
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.11961
Epicentral distance of station farthest from the epicenter (degree) 0.48833
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
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 96807321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 19:07:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GRIS.EHZ. 2021-10-20T18:48:04.87 0.3 undecidable manual S 305 0.4883 90 0.15 69
MN.TIP.HHZ. 2021-10-20T18:48:02.33 0.3 undecidable manual S 133 0.4092 91 -0.03 71
IV.CET2.HHZ. 2021-10-20T18:48:00.06 0.6 undecidable manual S 282 0.3292 91 0.08 48
IV.CAR1.HNZ. 2021-10-20T18:47:57.35 0.3 undecidable manual S 211 0.2392 91 0.02 73
IV.GRIS.EHZ. 2021-10-20T18:47:57.79 1.0 undecidable manual P 305 0.4883 90 0.23 23
IV.TDS.HHZ. 2021-10-20T18:47:55.88 0.6 undecidable manual S 353 0.2032 92 -0.38 46
IV.SPS2.HHZ. 2021-10-20T18:47:55.20 0.6 undecidable manual S 189 0.1691 94 -0.05 50
MN.TIP.HHZ. 2021-10-20T18:47:55.98 0.1 undecidable manual P 133 0.4092 91 -0.22 91
IV.CET2.HHZ. 2021-10-20T18:47:54.89 0.1 positive manual P 282 0.3292 91 0.06 96
IV.CAR1.HNZ. 2021-10-20T18:47:53.28 0.1 undecidable manual P 211 0.2392 91 -0.01 99
IV.CELI.HHZ. 2021-10-20T18:47:53.98 0.3 undecidable manual S 118 0.1196 106 0.17 75
IV.SPS2.HHZ. 2021-10-20T18:47:52.05 0.1 negative manual P 189 0.1691 94 -0.05 100
IV.TDS.HHZ. 2021-10-20T18:47:52.56 1.0 negative manual P 353 0.2032 92 -0.11 24
IV.CELI.HHZ. 2021-10-20T18:47:51.39 0.3 negative manual P 118 0.1196 106 0.13 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CELI.HHE. ML:1.3 0.0002165 0.14 AML other m 2021-10-20T18:47:54.14
IV.CELI.HHN. ML:1.1 0.00011395 0.14 AML other m 2021-10-20T18:47:54.40
IV.SPS2.HHN. ML:1 8.58E-5 0.14 AML other m 2021-10-20T18:47:55.28
IV.SPS2.HHE. ML:1 7.045E-5 0.98 AML other m 2021-10-20T18:47:55.42
IV.CET2.HHE. ML:1.4 0.00010105 1.22 AML other m 2021-10-20T18:48:01.96
IV.CET2.HHN. ML:1.6 0.0001425 0.48 AML other m 2021-10-20T18:48:01.19
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