Earthquake with magnitude of ML 1.5 on date 24-09-2021 and time 09:20:04 (Italy) in region 6 km SE Cassaro (SR)

A magnitude ML 1.5 earthquake occured in region: 6 km SE Cassaro (SR), on

  • 24-09-2021 07:20:04 (UTC)
  • 24-09-2021 09:20:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.077, 15.003 at 10 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
Cassaro SR 6 821 821
Canicattini Bagni SR 7 7109 7930
Ferla SR 7 2523 10453
Palazzolo Acreide SR 9 8808 19261
Sortino SR 10 8690 27951
Buscemi SR 11 1051 29002
Solarino SR 11 8091 37093
Floridia SR 13 22762 59855
Buccheri SR 15 1999 61854
Melilli SR 16 13621 75475
Giarratana RG 19 3048 78523
Priolo Gargallo SR 19 12091 90614

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km W of Siracusa (122291 inhabitants)
29 Km NE of Ragusa (73313 inhabitants)
32 Km NE of Modica (54633 inhabitants)
44 Km E of Vittoria (63339 inhabitants)
48 Km S of Catania (314555 inhabitants)
61 Km S of Acireale (52622 inhabitants)
67 Km E of Gela (75827 inhabitants)
95 Km SE of Caltanissetta (63360 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 1.5 2021-09-24
07:20:04
37.077 15.0027 10 2021-09-24
07:51:50
Sala Sismica INGV-Roma 95815561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-24 07:20:04 ± 0.2
Latitude 37.0770 ± 0.0135
Longitude 15.0027 ± 0.0192
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95815561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1920
Semi-minor axis of confidence ellipse (meter) 1170
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 305
Circular confidence region, given by single value of horizontal uncertainty (meter) 1920
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.48
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.25001
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 95815561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-24 07:51:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PE3.EHZ. 2021-09-24T07:21:54.65 3.0 positive manual Pg 14.31 0
IV.VBKN.HHZ. 2021-09-24T07:21:52.55 3.0 undecidable manual Sg 10.34 0
IV.FDMO.HHZ. 2021-09-24T07:21:41.39 3.0 negative manual Pg 11.35 0
IV.MMUR.HNZ. 2021-09-24T07:21:36.91 3.0 positive manual Pn 1.25 0
IV.PTRJ.HHZ. 2021-09-24T07:21:14.59 3.0 undecidable manual Pg 9.64 0
IV.CET2.HHZ. 2021-09-24T07:21:10.70 3.0 undecidable manual Sn -2.19 0
IV.VVLD.HHZ. 2021-09-24T07:21:09.11 3.0 negative manual Pn -4.1 0
IV.PALZ.HHZ. 2021-09-24T07:21:03.83 3.0 negative manual Pg 3.75 0
IX.STN3.HNZ.01 2021-09-24T07:21:03.66 3.0 undecidable manual Pg 9.75 0
IV.IVPL.HHZ. 2021-09-24T07:20:26.77 3.0 negative manual Pg 2.95 0
IV.ALJA.HHZ. 2021-09-24T07:20:19.19 3.0 undecidable manual P -2.81 0
IV.HMDC.HNZ. 2021-09-24T07:20:14.09 0.3 undecidable manual S 236 0.2113 50 0.3 70
IV.HCRL.HHZ. 2021-09-24T07:20:13.80 0.3 undecidable manual S 7 0.2077 50 0.12 73
IV.HVZN.HNZ. 2021-09-24T07:20:11.70 0.6 undecidable manual P 294 0.25 50 0.99 36
IV.SSY.HHZ. 2021-09-24T07:20:10.56 0.3 undecidable manual S 35 0.0989 134 0.4 70
IV.HSRS.HNZ. 2021-09-24T07:20:10.17 0.6 undecidable manual P 85 0.1754 118 0.82 40
IV.HCRL.HHZ. 2021-09-24T07:20:09.41 0.3 undecidable manual P 7 0.2077 50 -0.57 66
IV.HMDC.HNZ. 2021-09-24T07:20:09.63 0.1 undecidable manual P 236 0.2113 50 -0.41 91
IV.HAVL.HHZ. 2021-09-24T07:20:08.84 0.1 undecidable manual P 141 0.1511 122 -0.04 100
IV.SSY.HHZ. 2021-09-24T07:20:07.40 0.1 undecidable manual P 35 0.0989 134 -0.55 90
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSY.HHN. ML:2.3 0.0022 0.58 AML other m 2021-09-24T07:20:12.41
IV.SSY.HHE. ML:1.9 0.001037 0.7 AML other m 2021-09-24T07:20:12.74
IV.HCRL.HHN. ML:1.2 0.0001095 0.58 AML other m 2021-09-24T07:20:16.45
IV.HAVL.HHE. ML:1.6 0.000341 0.48 AML other m 2021-09-24T07:20:18.93
IV.HCRL.HHE. ML:1.4 0.00016 0.54 AML other m 2021-09-24T07:20:18.95
IV.HAVL.HHN. ML:1.6 0.0003215 0.56 AML other m 2021-09-24T07:20:19.31
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