Earthquake Costa Ragusana (Ragusa), Magnitude ML 3.8, 14 December 2017 time 02:13:45 (Timezone Italy)

A magnitude ML 3.8 earthquake occured in region: Costa Ragusana (Ragusa), on

14-12-2017 01:13:45 (UTC)
14-12-2017 02:13:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.4360, 14.6470 at 15 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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Display location by

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to

48 Km S of Modica (54633 inhabitants)

55 Km S of Ragusa (73313 inhabitants)

58 Km S of Vittoria (63339 inhabitants)

79 Km SE of Gela (75827 inhabitants)

90 Km SW of Siracusa (122291 inhabitants)

Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.

Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.

Shakemap

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and updated as more data become available. See http://shakemap.ingv.it for additional information. The black star indicates the epicenter. The triangles show the accelerometric and velocimetric stations used in the calculation, colored according to the recorded shaking.

Intensity Shakemap

This map shows the distribution of instrumental intensities. The intensity is derived through an empirical law that correlates the recorded values of actual ground shaking, e.g., acceleration and velocity, with the macroseismic intensity for Italian earthquakes, as reported in the Italian Macroseismic Database (DBMI15, https://doi.org/10.13127/cpti/cpti15.3).

Peak ground acceleration Shakemap

This map shows the distribution of peak ground acceleration expressed as percent of the acceleration of gravity (i.e., g = 9.81 m/s²).

Peak velocity Shakemap

This map shows the distribution of peak ground velocities expressed in cm/s.

Felt maps

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.

Locations history

Type	Magnitude	Date and Time (UTC)	Latitude	Longitude	Depth (km)	Published time (UTC)	Author	Location ID
Bulletin Rev1000	ML 3.8	2017-12-14 01:13:45	36.4362	14.6468	15	2017-12-17 08:03:29	Bollettino Sismico Italiano INGV	52590061
Reviewed Rev100	ML 3.9	2017-12-14 01:13:43	36.2953	14.752	10	2017-12-14 01:27:33	Sala Sismica INGV-Roma	52578171

Preferred location and magnitude until now.

Origin information

Origin

Field	Value
Time (UTC)	2017-12-14 01:13:45 ± 0.32
Latitude	36.4362 ± 0.0180
Longitude	14.6468 ± 0.0179
Depth (km)	15 ± 2 (from location)
Evaluation mode of Origin	manual
Evaluation status of Origin	reviewed
Version	1000 -> BULLETIN-INGV
Event type	earthquake
Origin ID	52590061

Uncertainty

Field	Value
Preferred uncertainty description	uncertainty ellipse
Semi-major axis of confidence ellipse (meter)	1896
Semi-minor axis of confidence ellipse (meter)	1457
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)	133
Circular confidence region, given by single value of horizontal uncertainty (meter)	1900.0
Confidence level of the uncertainty (%)	68

Quality

Field	Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)	192
Number of associated phases, regardless of their use for origin computation	42
Number of defining phases	42
RMS of the travel time residuals of the arrivals used for the origin computation (sec)	0.41
Epicentral distance of station closest to the epicenter (degree)	0.41459
Epicentral distance of station farthest from the epicenter (degree)	2.46324
Number of stations at which the event was observed	36
Number of stations from which data was used for origin computation	36

Magnitudes information

ML:3.8

Field	Value
Value	3.8
Uncertainty	0.3
Num. used stations	38
Type of magnitude	ML
Reference to an origin	52590061
Agency	INGV
Autore	Bollettino Sismico Italiano INGV
Time of creation (UTC)	2017-12-16 09:49:36

ML:3.9

Field	Value
Value	3.9
Uncertainty	0.3
Num. used stations	38
Type of magnitude	ML
Reference to an origin	52578171
Agency	INGV
Autore	Sala Sismica INGV-Roma
Time of creation (UTC)	2017-12-14 01:27:33

Picking and Arrival

SCNL	Time	Uncertainty	Polarity	Evaluation_mode	Phase	Azimuth	Distance(km)	Takeoff_angle	Residual	Weight
IV.PLAC.HHE.	2017-12-14T01:14:25.76	0.3	undecidable	manual	P	35	273.4152	54	-0.05	28
IV.JOPP.HNN.	2017-12-14T01:14:24.48	0.6	undecidable	manual	P	24	264.3354	54	-0.2	20
IV.MARS.EHE.	2017-12-14T01:14:20.73	0.6	undecidable	manual	P	309	235.1868	54	-0.32	24
MN.CEL.HNZ.	2017-12-14T01:14:20.11	0.6	undecidable	manual	P	28	230.2917	54	-0.34	25
IV.CRJA.HHZ.	2017-12-14T01:14:18.33	0.6	undecidable	manual	P	317	209.9343	54	0.42	28
IV.MSRU.HHE.	2017-12-14T01:14:18.51	0.6	undecidable	manual	P	20	216.5166	54	-0.22	28
IV.SOI.EHN.	2017-12-14T01:14:18.43	0.3	undecidable	manual	P	34	220.0131	54	-0.74	35
IV.SOLUN.HHZ.	2017-12-14T01:14:17.76	0.6	undecidable	manual	P	332	208.3359	54	0.04	31
IV.MTTG.HHE.	2017-12-14T01:14:16.00	0.6	undecidable	manual	P	28	197.1582	54	-0.32	31
IV.LPDG.HHE.	2017-12-14T01:14:16.72	0.3	undecidable	manual	P	241	207.7365	54	-0.92	34
IV.CORL.HHZ.	2017-12-14T01:14:16.66	0.3	undecidable	manual	P	324	200.6436	54	-0.1	47
IV.AGST.EHE.	2017-12-14T01:14:15.79	0.6	undecidable	manual	S	29	104.5176	93	-0.15	45
IV.HLNI.HHZ.	2017-12-14T01:14:15.03	0.6	undecidable	manual	S	11	103.119	93	-0.53	42
IV.NOV.HHZ.	2017-12-14T01:14:15.09	0.6	undecidable	manual	P	14	181.7847	54	0.68	30
IV.HAGA.HHZ.	2017-12-14T01:14:15.52	0.6	undecidable	manual	S	25	104.4177	93	-0.37	43
IV.MMGO.HHN.	2017-12-14T01:14:15.63	0.3	undecidable	manual	P	313	200.8434	54	-1.16	32
IV.MUCR.HHZ.	2017-12-14T01:14:14.62	0.3	undecidable	manual	P	6	179.3871	54	0.51	49
IV.MSFR.HHZ.	2017-12-14T01:14:14.10	0.3	undecidable	manual	P	358	177.2892	54	0.25	53
IV.PLLN.EHZ.	2017-12-14T01:14:14.35	0.3	undecidable	manual	P	346	178.2882	54	0.38	51
MN.CLTB.HHN.	2017-12-14T01:14:14.57	0.6	undecidable	manual	P	315	179.1873	54	0.48	33
IV.AIO.HHZ.	2017-12-14T01:14:14.34	0.3	undecidable	manual	P	17	177.9885	54	0.41	51
IV.CSLB.HHZ.	2017-12-14T01:14:13.64	0.1	negative	manual	P	343	174.492	54	0.14	73
IV.ALJA.HHZ.	2017-12-14T01:14:13.28	0.3	undecidable	manual	P	332	165.7119	54	0.87	46
IV.PETRA.HHZ.	2017-12-14T01:14:12.30	0.1	negative	manual	P	343	162.0156	92	0.36	74
IV.LINA.HHE.	2017-12-14T01:14:12.94	0.6	undecidable	manual	P	249	171.5949	54	-0.2	36
IV.SSY.HHZ.	2017-12-14T01:14:12.06	0.3	undecidable	manual	S	25	88.5447	93	0.39	65
IV.EPZF.HHZ.	2017-12-14T01:14:11.96	0.1	positive	manual	P	7	155.0226	92	1.09	57
IV.EMSG.HHZ.	2017-12-14T01:14:11.41	0.3	undecidable	manual	P	10	155.9217	92	0.41	56
IV.RESU.HHZ.	2017-12-14T01:14:10.26	0.3	undecidable	manual	P	339	144.1446	92	1.08	45
IV.EPOZ.HHZ.	2017-12-14T01:14:09.89	0.3	undecidable	manual	P	19	145.2435	92	0.54	56
IV.GALF.HHZ.	2017-12-14T01:14:09.13	0.1	negative	manual	P	357	141.5472	92	0.34	80
IV.ESLN.HHZ.	2017-12-14T01:14:09.67	0.3	undecidable	manual	P	12	142.4463	92	0.74	52
IV.ESML.HHZ.	2017-12-14T01:14:07.48	0.3	undecidable	manual	P	9	132.6672	92	0.05	65
IV.HMDC.HHZ.	2017-12-14T01:14:03.17	0.6	undecidable	manual	S	12	59.2962	95	-0.7	43
IV.HAGA.HHZ.	2017-12-14T01:14:02.30	0.3	undecidable	manual	P	25	104.4177	93	-0.77	56
IV.AGST.EHE.	2017-12-14T01:14:02.20	0.3	undecidable	manual	P	29	104.5176	93	-0.89	53
IV.HLNI.HHZ.	2017-12-14T01:14:02.27	0.1	positive	manual	P	11	103.119	93	-0.61	80
IV.HPAC.HHE.	2017-12-14T01:14:01.33	0.6	undecidable	manual	S	49	46.0206	97	0.96	37
IV.SSY.HHZ.	2017-12-14T01:14:00.23	0.1	positive	manual	P	25	88.5447	93	-0.4	88
IV.RAFF.HHZ.	2017-12-14T01:14:00.38	0.1	undecidable	manual	P	344	90.8424	93	-0.6	82
IV.HMDC.HHZ.	2017-12-14T01:13:55.10	0.1	negative	manual	P	12	59.2962	95	-1.02	73
IV.HPAC.HHE.	2017-12-14T01:13:54.24	0.1	positive	manual	P	49	46.0206	97	0.14	100

Station Magnitude and Amplitude

SCNL	mag	Generic_amplitude	Period	Type	Category	Unit	Time_window_reference
IV.HMDC.HHN.	ML:4.0	0.01958376	0.68	AML	other	m	2017-12-14T01:14:06.01
IV.HMDC.HHE.	ML:4.1	0.02714775	0.72	AML	other	m	2017-12-14T01:14:11.57
IV.SSY.HHE.	ML:4.3	0.023481210000000002	0.64	AML	other	m	2017-12-14T01:14:12.94
IV.SSY.HHN.	ML:4.2	0.020316935	0.32	AML	other	m	2017-12-14T01:14:16.42
IV.RAFF.HHN.	ML:3.3	0.002316311	0.94	AML	other	m	2017-12-14T01:14:14.90
IV.RAFF.HHE.	ML:3.4	0.0028382005	0.6	AML	other	m	2017-12-14T01:14:20.00
IV.HLNI.HHE.	ML:3.8	0.006632539	0.24	AML	other	m	2017-12-14T01:14:17.79
IV.HLNI.HHN.	ML:3.7	0.004981519	0.38	AML	other	m	2017-12-14T01:14:18.13
IV.ESML.HHN.	ML:3.9	0.005333111000000001	0.8	AML	other	m	2017-12-14T01:14:40.47
IV.ESML.HHE.	ML:3.8	0.0043949815	0.9	AML	other	m	2017-12-14T01:14:33.47
IV.GALF.HHN.	ML:3.8	0.003750916	0.66	AML	other	m	2017-12-14T01:14:32.82
IV.GALF.HHE.	ML:3.9	0.004412371	0.6	AML	other	m	2017-12-14T01:14:32.73
IV.ESLN.HHN.	ML:4.0	0.005768484	0.9	AML	other	m	2017-12-14T01:14:34.86
IV.ESLN.HHE.	ML:4.1	0.007625553	0.98	AML	other	m	2017-12-14T01:14:48.35
IV.EPOZ.HHE.	ML:4.0	0.0053666905	1.02	AML	other	m	2017-12-14T01:14:37.14
IV.EPOZ.HHN.	ML:4.0	0.005019164	1.04	AML	other	m	2017-12-14T01:14:47.14
IV.RESU.HHN.	ML:3.6	0.0024749675	1.02	AML	other	m	2017-12-14T01:14:36.30
IV.RESU.HHE.	ML:3.5	0.0016805004999999999	0.76	AML	other	m	2017-12-14T01:14:40.83
IV.EMSG.HHN.	ML:4.0	0.005225652	0.92	AML	other	m	2017-12-14T01:14:44.41
IV.EMSG.HHE.	ML:4.0	0.004955593	0.62	AML	other	m	2017-12-14T01:14:40.89
IV.EPZF.HHN.	ML:4.1	0.005688895	0.58	AML	other	m	2017-12-14T01:14:40.27
IV.EPZF.HHE.	ML:4.1	0.005500481	0.86	AML	other	m	2017-12-14T01:14:37.73
IV.PETRA.HHN.	ML:3.7	0.002148951	0.88	AML	other	m	2017-12-14T01:14:49.57
IV.PETRA.HHE.	ML:3.7	0.0024325584999999998	0.86	AML	other	m	2017-12-14T01:14:42.67
IV.ALJA.HHE.	ML:3.4	0.00095129435	0.6	AML	other	m	2017-12-14T01:14:44.17
IV.ALJA.HHN.	ML:3.3	0.00092580005	1.04	AML	other	m	2017-12-14T01:14:57.60
IV.CSLB.HHN.	ML:3.3	0.0007325306499999999	1.34	AML	other	m	2017-12-14T01:14:45.73
IV.CSLB.HHE.	ML:3.4	0.00100007275	0.66	AML	other	m	2017-12-14T01:14:48.74
IV.MSFR.HHE.	ML:3.5	0.0012820070000000002	0.94	AML	other	m	2017-12-14T01:14:51.94
IV.MSFR.HHN.	ML:3.6	0.001385723	0.96	AML	other	m	2017-12-14T01:14:45.88
IV.AIO.HHN.	ML:3.7	0.00181431265	0.7	AML	other	m	2017-12-14T01:14:49.76
IV.AIO.HHE.	ML:3.8	0.002654365	0.46	AML	other	m	2017-12-14T01:14:43.68
IV.PLLN.EHE.	ML:3.9	0.003083938	0.96	AML	other	m	2017-12-14T01:14:45.41
IV.PLLN.EHN.	ML:4.0	0.003559701	0.54	AML	other	m	2017-12-14T01:14:48.01
IV.MUCR.HHE.	ML:3.9	0.0029025569999999996	0.64	AML	other	m	2017-12-14T01:14:49.63
IV.MUCR.HHN.	ML:3.8	0.002130453	0.58	AML	other	m	2017-12-14T01:14:50.70
IV.SOLUN.HHE.	ML:3.8	0.001750376	0.9	AML	other	m	2017-12-14T01:14:55.86
IV.SOLUN.HHN.	ML:3.6	0.00115945045	0.88	AML	other	m	2017-12-14T01:14:55.78

TDMT - Time Domain Moment Tensor

Warning: the following TDMT solution has been computed starting from an event location obtained before the preferred one showned at the moment.

TDMT details

Field	Value
Magnitude	3.8
Scalar Moment	6.83207E+21 dyne-cm
Computed depth	5 km
Quality	Ca
Variance Reduction	34.42%
Double Couple	63%
CLVD	37%
ISO	0%
Model used	CIA
Mode	automatic
Status	preliminary

Moment Tensor Components

Component	Value
Mrr	1.9155E+21
Mtt	3.6589E+21
Mpp	-5.5744E+21
Mrt	1.7314E+21
Mrp	4.1349E+21
Mtp	1.9892E+21

Nodal Planes

Name	Strike	Dip	Rake
PN1	26	80	134
PN2	126	45	14

Fault Plane solution

psmeca (GMT documentation)

14.752 36.2953 5 26 80 134 126 45 14 6.83207 21 15.252 36.7953

TDMT references

More info and references

PDF Solution

Download TDMT soution in PDF format

Station Distribution

TDMT station details

Station	Epicentral Distance (km)	Epicentral Azimuth	Variance Reduction	zcor
EPOZ	157.6	14.1	22.83%	113
HAGA	115.6	18	57.14%	106
HMDC	73.7	2.2	22.23%	100
SSY	99.9	16.6	74.38%	104

Fault Plane solutions in the area

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.

Download

Type	Description	Link
QuakeML - small	Event, Origin, FocalMechanism	Download
QuakeML - full	Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude	Download
Waveforms	Seismic signals in miniseed + resp format	Download

Earthquake with magnitude of ML 3.8 on date 14-12-2017 and time 02:13:45 (Italy) in region Costa Ragusana (Ragusa)