"And for the tremors." What are tremors? Rav Katina said: An earthquake. Rav Katina was once going along the way. When he reached the entrance of the house of a certain necromancer, an earthquake rumbled. He said: Does the necromancer know what this earthquake is? The necromancer raised his voice and said to him: Katina, Katina, why should I not know? At the moment when the Holy One, blessed be He, remembers His children who dwell in distress among the nations of the world, He lets fall two tears into the Great Sea, and His voice is heard from one end of the world to the other, and this is the earthquake.
What Causes Earthquakes?
Berakhot 59a
וְעַל הַזְּוָעוֹת. מַאי זְוָעוֹת? אָמַר רַב קַטִּינָא: גּוּהָא. רַב קַטִּינָא הֲוָה קָאָזֵיל בְּאוֹרְחָא. כִּי מְטָא אַפִּתְחָא דְּבֵי אוֹבָא טַמְיָא גְּנַח גּוּהָא. אָמַר: מִי יָדַע אוֹבָא טַמְיָא הַאי גּוּהָא מַהוּ? רְמָא לֵיהּ קָלָא: קַטִּינָא קַטִּינָא, אַמַּאי לָא יָדַעְנָא? בְּשָׁעָה שֶׁהַקָּדוֹשׁ בָּרוּךְ הוּא זוֹכֵר אֶת בָּנָיו שֶׁשְּׁרוּיִים בְּצַעַר בֵּין אוּמּוֹת הָעוֹלָם מוֹרִיד שְׁתֵּי דְמָעוֹת לַיָּם הַגָּדוֹל, וְקוֹלוֹ נִשְׁמָע מִסּוֹף הָעוֹלָם וְעַד סוֹפוֹ, וְהַיְינוּ גּוּהָא.