Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-09-2021 and time 19:28:07 (Italy) in region 2 km E Acri (CS)

A magnitude ML 1.4 earthquake occured in region: 2 km E Acri (CS), on

  • 04-09-2021 17:28:07 (UTC)
  • 04-09-2021 19:28:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.4920, 16.4080 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.

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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 2 20858 20858
Santa Sofia d'Epiro CS 9 2628 23486
San Demetrio Corone CS 9 3559 27045
San Cosmo Albanese CS 10 591 27636
Bisignano CS 11 10203 37839
San Giorgio Albanese CS 11 1432 39271
Vaccarizzo Albanese CS 11 1125 40396
Luzzi CS 11 9396 49792
Rose CS 14 4373 54165
Corigliano Calabro CS 15 40427 94592
Longobucco CS 18 3183 97775
San Pietro in Guarano CS 18 3663 101438
Tarsia CS 18 2054 103492
Castiglione Cosentino CS 18 2896 106388
Terranova da Sibari CS 19 5100 111488

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Cosenza (67546 inhabitants)
58 Km N of Lamezia Terme (70714 inhabitants)
67 Km N of Catanzaro (90612 inhabitants)
77 Km NW of Crotone (62178 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.4 2021-09-04
17:28:07		 39.4917 16.4083 10 2022-03-30
13:04:26		 Bollettino Sismico Italiano INGV 99320481
Reviewed
Rev100 		ML 1.4 2021-09-04
17:28:07		 39.4777 16.4048 11 2021-09-04
17:33:56		 Sala Sismica INGV-Roma 95039491
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-04 17:28:07 ± 0.08
Latitude 39.4917 ± 0.0045
Longitude 16.4083 ± 0.0070
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 99320481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 583
Semi-minor axis of confidence ellipse (meter) 143
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
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) 0.11781
Epicentral distance of station farthest from the epicenter (degree) 0.50452
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 95039491
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-04 17:33:56

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 99320481
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-04 13:31:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SERS.HNN. 2021-09-04T17:28:25.36 0.6 undecidable manual S 154 55.9995 50 0.16 46
IV.CET2.HHZ. 2021-09-04T17:28:21.01 0.6 undecidable manual S 276 39.0276 50 0.34 46
IV.PIPA.HHZ. 2021-09-04T17:28:20.01 0.6 undecidable manual S 91 34.8429 50 0.45 45
IV.CAR1.HHN. 2021-09-04T17:28:18.57 0.6 undecidable manual S 213 31.3464 50 -0.05 49
IV.SERS.HNN. 2021-09-04T17:28:17.83 0.3 undecidable manual P 154 55.9995 50 0.07 71
IV.GRIS.EHZ. 2021-09-04T17:28:17.60 0.3 undecidable manual P 300 54.9006 50 0.01 71
IV.SPS2.HHZ. 2021-09-04T17:28:16.08 0.6 undecidable manual S 195 23.0547 114 -0.27 48
IV.LADO.EHE. 2021-09-04T17:28:16.82 0.3 undecidable manual P 115 54.1014 50 -0.65 61
IV.CET2.HHZ. 2021-09-04T17:28:15.22 0.1 undecidable manual P 276 39.0276 50 0.07 97
IV.TDS.HHZ. 2021-09-04T17:28:15.05 0.6 undecidable manual S 342 19.6692 117 -0.24 48
IV.PIPA.HHZ. 2021-09-04T17:28:14.22 0.3 undecidable manual P 91 34.8429 50 -0.29 70
IV.CELI.HHZ. 2021-09-04T17:28:13.54 0.6 undecidable manual S 139 13.0758 128 0.17 50
IV.CAR1.HHN. 2021-09-04T17:28:13.88 0.3 undecidable manual P 213 31.3464 50 -0.09 73
IV.TDS.HHZ. 2021-09-04T17:28:12.13 0.1 undecidable manual P 342 19.6692 117 0.09 100
IV.SPS2.HHZ. 2021-09-04T17:28:12.60 0.1 undecidable manual P 195 23.0547 114 -0.05 100
IV.CELI.HHZ. 2021-09-04T17:28:11.22 0.1 negative manual P 139 13.0758 128 0.29 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CELI.HHE. ML:1.5 0.0003095 1.76 AML other m 2021-09-04T17:28:14.08
IV.CELI.HHN. ML:1.4 0.00029600000000000004 1.32 AML other m 2021-09-04T17:28:14.94
IV.SPS2.HHN. ML:1.3 0.00013800000000000002 0.92 AML other m 2021-09-04T17:28:16.31
IV.SPS2.HHE. ML:1.3 0.0001315 0.4 AML other m 2021-09-04T17:28:16.54
IV.PIPA.HHE. ML:1.4 0.00011649999999999999 1.76 AML other m 2021-09-04T17:28:21.04
IV.PIPA.HHN. ML:1.3 0.00008745 1.1 AML other m 2021-09-04T17:28:22.60
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