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BMKG_3.m
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BMKG_3.m
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%% %Purpose
%To determine a specific frequency that produces the most frequent maximum
%amplitude of PSD spectrum.
%% %Place and time inputs
stn='CEB'; %Abbreviation of station name
date_start=[2012,01,20,00,00,00]; %Insert custom start and end dates
date_end= [2012,02,06,23,59,59]; %Period spanning through 3 consecutive years is the maximum
%% %Customization
%Set magnitude % distance
mag_min=5.0;
dis_max=300;
%Segmentation (in secs)
N_seg=3600;
%Range #1------------------------------------------------------------------
%Frequency range for PSD
f_1=0.007;
f_2=0.022;
%Bandpass filter range for filtered data
bpf1=f_1;
bpf2=f_2;
%Range #2------------------------------------------------------------------
%Frequency range for PSD
f_3=0.022;
f_4=0.100;
%Bandpass filter range for filtered data
bpf3=f_3;
bpf4=f_4;
%% %Load files and time calculation
%Loading files
load VARIABLES_WORLD
%Time period
datenum_start=datenum(date_start);
datenum_end=datenum(date_end);
if date_start(1)==date_end(1)
year=string(date_start(1));
else
year=sprintf('%s-%s',string(date_start(1)),string(date_end(1)));
end
j=date_start(1);
for i=1:3
year_vec(1,i)=j;
if j==date_end(1)
break
end
j=j+1;
end
if numel(year_vec)==1
matname=strcat(stn,string(year_vec(1)),'S');
load(matname);
end
if numel(year_vec)==2
matname(1)=strcat(stn,string(year_vec(1)),'S');
matname(2)=strcat(stn,string(year_vec(2)),'S');
A=load(matname(1));
B=load(matname(2));
H=vertcat(A.H,B.H);
D=vertcat(A.D,B.D);
Z=vertcat(A.Z,B.Z);
UT1m=horzcat(A.UT1m,B.UT1m);
end
if numel(year_vec)==3
matname(1)=strcat(stn,string(year_vec(1)),'S');
matname(2)=strcat(stn,string(year_vec(2)),'S');
matname(3)=strcat(stn,string(year_vec(3)),'S');
A=load(matname(1));
B=load(matname(2));
C=load(matname(3));
H=vertcat(A.H,B.H,C.H);
D=vertcat(A.D,B.D,C.D);
Z=vertcat(A.Z,B.Z,C.Z);
UT1m=horzcat(A.UT1m,B.UT1m,C.UT1m);
end
%Creating time vector
time_vec=datetime(datevec(datenum_start:1/86400:datenum_end),'Format','dd/MM/yyyy HH:mm:ss');
timenum_vec=datenum_start:1/86400:datenum_end;
welchnum_vec=datenum_start:1/(86400/N_seg):datenum_end;
datenum_vec=datenum_start:1:datenum_end;
%% %Station setting
%Setting station number
stn_vec={'TGG';'MUT';'LGZ';'CEB';'CDO';'DAV';'GSI';'SCN';'LWA';'PTN';'MND';
'BIK';'JYP';'PRP';'KPG';'KTB';'DAW';'LKW';'SBH';'PER';'BTG';'KTN';'TIK';
'CHD';'CST';'ZYK';'ZGN';'MGD';'YAK';'PTK';'ASB';'TNO';'ONW';'OIS';'KUJ';
'AMA';'HLN';'EWA';'YAP';'BCL';'HVD';'TIR';'CMB';'CKT';'TWV';'ROC';'LMT';
'CGR';'CMD';'CAN';'MLB';'HOB';'MCQ';'DVS';'WAD';'GLY';'JRS';'TPT';'TMA';
'ANC';'HUA';'ICA';'EUS';'SMA';'LAQ';'FYM';'ASW';'KRT';'AAB';'ILR';'ABU';
'LAG';'ABJ';'NAB';'DES';'LSK';'MPT';'DRB';'HER'};
station_vec={'Tuguegarao';'Muntinlupa';'Legazpi';'Cebu';'Cagayan De Oro';'Davao';
'Gunung Sitoli';'Sicincin';'Liwa';'Pontianak';'Manado';'Biak';'Jayapura';'Pare Pare';
'Kupang';'Kototabang';'Darwin';'Langkawi';'Sabah';'Perak';'Banting';'Kotelnyy';
'Tixie';'Chokurdakh';'Cape Schmidt';'Zyryanka';'Zhigansk';'Magadan';'Yakutsk';
'Paratunka';'Ashibetsu';'Tohno';'Onagawa';'Oiso';'Kuju';'Amami-Oh-shima';
'Hualien';'Ewa Beach';'Yap Island';'Bac Lieu';'Khovd';'Tirunelveli';'Colombo';
'Cooktown';'Townsville';'Rockhampton';'Learmonth';'Culgoora';'Camden';'Canberra';
'Crib Point';'Hobart';'Macquarie Island';'Davis';'Wadena';'Glyndon';'Jerusalem';
'Tarapoto';'Tingo Maria';'Ancon';'Huancayo';'Ica';'Eusebio';'Santa Maria';
'Laquila';'Fayum';'Aswan';'Khartoum';'Adis Ababa';'Ilorin';'Abuja';'Lagos';
'Abidjan';'Nairobi';'Dal Es Salaam';'Lusaka';'Maputo';'Durban';'Hermanus'};
for i=1:length(stn_MAGDAS)
if strcmp(stn,stn_vec(i))
stn_num=i;
station=string(station_vec(i));
break;
end
end
%Getting station coordinate
stn_latlon=[stn_MAGDAS(stn_num,2:3)];
%% %Building selected earthquakes table
EQ_table=NaN(1,11);
j=1;
for i=1:length(EQ_WORLD)
if datenum(EQ_WORLD(i,1:6))>=datenum_start && datenum(EQ_WORLD(i,1:6))<=datenum_end
EQ_table(j,:)=EQ_WORLD(i,:);
j=j+1;
end
if datenum(EQ_WORLD(i,1:6))>datenum_end
break
end
end
i=1;
EQ_sel=NaN(1,7);
for j=1:size(EQ_table,1)
if EQ_table(j,10)>=mag_min
EQ_latlon=[EQ_table(j,7:8)];
EQ_dis=deg2km(distance('gc',stn_latlon,EQ_latlon));
EQ_time=datenum(EQ_table(j,1:6));
EQ_mag=EQ_table(j,10);
EQ_Ks=(10^(0.75*EQ_mag))/(EQ_dis+100);
EQ_depth=EQ_table(j,9);
if EQ_dis<=dis_max
EQ_sel(i,1)=EQ_time;
EQ_sel(i,2)=EQ_dis;
EQ_sel(i,3)=EQ_mag;
EQ_sel(i,4)=EQ_Ks;
EQ_sel(i,5)=EQ_depth;
EQ_sel(i,6:7)=EQ_latlon;
i=i+1;
end
end
end
%% %Geomagnetic data pre-processing
j=1;
for i=1:length(H)
if UT1m(1,i)==datenum_start
H_period(j:j+length(time_vec)-1,1)=H(i:i+length(time_vec)-1,1);
D_period(j:j+length(time_vec)-1,1)=D(i:i+length(time_vec)-1,1);
Z_period(j:j+length(time_vec)-1,1)=Z(i:i+length(time_vec)-1,1);
break
end
end
%Removing noise/outlier
H_dn=medfilt1(H_period,'omitnan');
D_dn=medfilt1(D_period,'omitnan');
Z_dn=medfilt1(Z_period,'omitnan');
for i=1:5
H_sig=std(H_dn,'omitnan');
H_mu=mean(H_dn,'omitnan');
D_sig=std(D_dn,'omitnan');
D_mu=mean(D_dn,'omitnan');
Z_sig=std(Z_dn,'omitnan');
Z_mu=mean(Z_dn,'omitnan');
for j=1:length(H_dn)
if H_dn(j)>H_mu+5*H_sig||H_dn(j)<H_mu-5*H_sig
H_dn(j)=NaN;
end
if D_dn(j)>D_mu+5*D_sig||D_dn(j)<D_mu-5*D_sig
D_dn(j)=NaN;
end
if Z_dn(j)>Z_mu+5*Z_sig||Z_dn(j)<Z_mu-5*Z_sig
Z_dn(j)=NaN;
end
end
end
%Fill gaps
H_dn=fillgaps(H_dn,60);
D_dn=fillgaps(D_dn,60);
Z_dn=fillgaps(Z_dn,60);
%% %Set nighttime data
% %Nighttime data in LT
% LT_length=LT_end-LT_start;
% if LT_length<0
% LT_length=LT_length+24;
% end
% t_zone=timezone(stn_latlon(2),'degrees');
% t_start=LT_start+t_zone;
% if t_start>24
% t_start=t_start-24;
% end
% if t_start<0
% t_start=t_start+24;
% end
% t_starts=t_start*3600;
% t_int=LT_length*3600;
%
% for i=1:days_num
%
% H_night(:,i)=H_dn(t_starts:t_starts+t_int-1);
% D_night(:,i)=D_dn(t_starts:t_starts+t_int-1);
% Z_night(:,i)=Z_dn(t_starts:t_starts+t_int-1);
% t_starts=t_starts+86400;
% end
%% %PSD calculation
H_seg=reshape(H_dn,N_seg,[]);
D_seg=reshape(D_dn,N_seg,[]);
Z_seg=reshape(Z_dn,N_seg,[]);
n_win=1800;
n_ovrlp=0.5*n_win;
n_fft=n_win;
fs=1;
bin_1=round(((n_fft/2+1)/0.5)*f_1);
bin_2=round(((n_fft/2+1)/0.5)*f_2);
bin_3=round(((n_fft/2+1)/0.5)*f_3);
bin_4=round(((n_fft/2+1)/0.5)*f_4);
[H_wlch,f_wlch]=pwelch(H_seg,hamming(n_win),n_ovrlp,n_fft,fs);
H_wlch1=H_wlch(bin_1:bin_2,:);
H_wlch2=H_wlch(bin_3:bin_4,:);
[Z_wlch,f_wlch]=pwelch(Z_seg,hamming(n_win),n_ovrlp,n_fft,fs);
Z_wlch1=Z_wlch(bin_1:bin_2,:);
Z_wlch2=Z_wlch(bin_3:bin_4,:);
%% %Power ratio
ZH_wlch1=Z_wlch1./H_wlch1;
ZH_wlch2=Z_wlch2./H_wlch2;
frange1=(((f_2-f_1)/size(ZH_wlch1,1))*(1:size(ZH_wlch1,1)))+f_1;
frange2=(((f_4-f_3)/size(ZH_wlch2,1))*(1:size(ZH_wlch2,1)))+f_3;
[max_wlch1,max_i1]=max(ZH_wlch1);
[max_wlch2,max_i2]=max(ZH_wlch2);
max_f1=(((f_2-f_1)/size(ZH_wlch1,1))*max_i1)+f_1;
max_f2=(((f_4-f_3)/size(ZH_wlch2,1))*max_i2)+f_3;
%% %Number of occurence
j=1;
for i=1:length(frange1)
max_occ1(1,i)=sum(max_f1(1,:)==frange1(1,i));
end
j=1;
for i=1:length(frange2)
max_occ2(1,i)=sum(max_f2(1,:)==frange2(1,i));
end
%% %Acquiring ap and Dst indices
k=1;
for i=1:length(index_geomag)
m=datenum(index_geomag(i,1),1,index_geomag(i,2));
if m>=datenum_start && m<=datenum_end
ap(k:k+3599,1)=index_geomag(i,6);
Dst(k:k+3599,1)=index_geomag(i,5);
k=k+3600;
end
end
%% %Figure 1
title_sup=sprintf('%s station, %s',station,datetime(mean(time_vec),'Format','MMM yyyy'));
f1=figure(1);
stitle=suptitle(sprintf('%s',title_sup));
stitle_pos =get(stitle,'position');
stitle_pos=[stitle_pos(1) stitle_pos(2)+0.01 stitle_pos(3)];
set(stitle,'position',stitle_pos);
subplot(2,2,[1 2])
plot(time_vec,ap,'b');
hold on
plot(time_vec,Dst,'r');
plot(time_vec,ones(length(time_vec),1)*(50),'b--');
plot(time_vec,ones(length(time_vec),1)*(-50),'r--');
hold off
ylabel('Dst ap');
xlim([min(time_vec) max(time_vec)])
if max(ap)>50 || min(Dst)<-50
ylim([min(Dst)-10 max(ap)+10])
else
ylim([-60 60])
end
yyaxis right
for i=1:size(EQ_sel,1)
j=datetime(datevec(EQ_sel(i,1)),'Format','dd/MM/yyyy HH:mm:ss');
plot(j,EQ_sel(i,4),'ko','MarkerFaceColor','k','MarkerSize',5);
if EQ_sel(i,4)==max(EQ_sel(:,4))
label=sprintf('%s M%0.1f %.0fKM',string(datetime(j,'Format','dd/MM/yyyy')),EQ_sel(i,3),EQ_sel(i,5));
text(j,EQ_sel(i,4),label,'VerticalAlignment','top','HorizontalAlignment','left')
end
hold on
end
hold off
xlim([min(time_vec) max(time_vec)])
ylabel('K_{LS}');
title('Geomagnetic (left) & local seismicity (right) indices');
colpal=jet(size(max_wlch1,2));
subplot(2,2,3)
for i=1:size(max_wlch1,2)
plot(max_f1(1,i),max_wlch1(1,i),'o','Color',colpal(i,:))
hold on
end
hold off
ylabel('Z/H_{Max power}')
xlim([min(frange1) max(frange1)])
ylim([0 1.5*max(max_wlch1)])
xlabel('Frequency (Hz)')
title(sprintf('Z/H maximum power (%0.3f - %.3f Hz)',f_1,f_2));
subplot(2,2,4)
for i=1:size(max_wlch2,2)
plot(max_f2(1,i),max_wlch2(1,i),'o','Color',colpal(i,:))
hold on
end
hold off
ylabel('Z/H_{Max power}')
xlim([min(frange2) max(frange2)])
ylim([0 1.5*max(max_wlch2)])
xlabel('Frequency (Hz)')
title(sprintf('Z/H maximum power (%0.3f - %.3f Hz)',f_3,f_4));
set(gcf, 'Position', get(0, 'Screensize'));
%% %Figure 2
f2=figure(2);
stitle=suptitle(sprintf('%s',title_sup));
stitle_pos =get(stitle,'position');
stitle_pos=[stitle_pos(1) stitle_pos(2)+0.01 stitle_pos(3)];
set(stitle,'position',stitle_pos);
subplot(3,1,1)
plot(time_vec,ap,'b');
hold on
plot(time_vec,Dst,'r');
plot(time_vec,ones(length(time_vec),1)*(50),'b--');
plot(time_vec,ones(length(time_vec),1)*(-50),'r--');
hold off
ylabel('Dst ap');
xlim([min(time_vec) max(time_vec)])
if max(ap)>50 || min(Dst)<-50
ylim([min(Dst)-10 max(ap)+10])
else
ylim([-60 60])
end
yyaxis right
for i=1:size(EQ_sel,1)
j=datetime(datevec(EQ_sel(i,1)),'Format','dd/MM/yyyy HH:mm:ss');
plot(j,EQ_sel(i,4),'ko','MarkerFaceColor','k','MarkerSize',5);
if EQ_sel(i,4)==max(EQ_sel(:,4))
label=sprintf('%s M%0.1f %.0fKM',string(datetime(j,'Format','dd/MM/yyyy')),EQ_sel(i,3),EQ_sel(i,5));
text(j,EQ_sel(i,4),label,'VerticalAlignment','bottom','HorizontalAlignment','left')
end
hold on
end
hold off
xlim([min(time_vec) max(time_vec)])
ylabel('K_{LS}');
title('Geomagnetic (left) & local seismicity (right) indices');
subplot(3,1,2)
plot(time_vec,ZH_2);
ylabel('Power_{Z/H}')
xlim([min(time_vec) max(time_vec)])
ylim([min(ZH_2) 1.2*max(ZH_2)])
title(sprintf('Z/H power ratio (%0.3f - %.3f Hz)',f_3,f_4));
amp_max=max(ZH_2);
label=sprintf('%0.2f',amp_max);
for i=1:length(ZH_2)
if ZH_2(i)==amp_max
text(time_vec(i),amp_max,label,'VerticalAlignment','bottom','HorizontalAlignment','left')
break
end
end
subplot(3,1,3)
plot(time_vec,ZH2_filt,'r')
ylabel('Z/H_{filtered}');
xlim([min(time_vec) max(time_vec)])
title(sprintf('Bandpass filtered of Z/H (%0.3f - %.3f Hz)',bpf3,bpf4));
set(gcf, 'Position', get(0, 'Screensize'));
%--------------------------------------------------------------------------
%% %Saving figures
MMM_yyyy=upper(string(datetime(mean(time_vec),'Format','MMMyyyy')));
today=char(datetime('today','Format','dd-MM-yyyy'));
today=strcat(today,'\BMKG_3\');
path1='D:\OneDrive\Belajar\Dr. Adib Yusof\Data dan Analisis\Percubaan\Cubaan 2\Figures\';
mkdir(fullfile(path1,today));
path2=strcat('D:\OneDrive\Belajar\Dr. Adib Yusof\Data dan Analisis\Percubaan\Cubaan 2\Figures\',today);
fq_1=regexprep(string(f_1),'[.]','');
fq_2=regexprep(string(f_2),'[.]','');
fq_3=regexprep(string(f_3),'[.]','');
fq_4=regexprep(string(f_4),'[.]','');
figname1=char(strcat(stn,'-',MMM_yyyy,'-',fq_1,'-',fq_2,'(ZH)'));
saveas(f1,fullfile(path2,figname1),'tiff');
figname2=char(strcat(stn,'-',MMM_yyyy,'-',fq_3,'-',fq_4,'(ZH)'));
saveas(f2,fullfile(path2,figname2),'tiff');